Revert SSHD config change.
#### Why I did it
Some test case and code may impact by SSHD config change.
#### How I did it
Revert following change in build_debian.sh script:
ClientAliveInterval change back to 900.
MaxAuthTries change back to default value.
Banner change to disabled.
#### How to verify it
Pass all E2E test case.
#### Which release branch to backport (provide reason below if selected)
<!--
- Note we only backport fixes to a release branch, *not* features!
- Please also provide a reason for the backporting below.
- e.g.
- [x] 202006
-->
- [ ] 201811
- [ ] 201911
- [ ] 202006
- [ ] 202012
- [ ] 202106
- [ ] 202111
- [ ] 202205
#### Description for the changelog
Revert SSHD config change.
#### Link to config_db schema for YANG module changes
<!--
Provide a link to config_db schema for the table for which YANG model
is defined
Link should point to correct section on https://github.com/Azure/sonic-buildimage/blob/master/src/sonic-yang-models/doc/Configuration.md
-->
#### A picture of a cute animal (not mandatory but encouraged)
Why I did it
nameserver and domain entries from build system fsroot gets into sonic image.
How I did it
Clear /etc/resolv.conf before building image
How to verify it
Built image with it and verified with install that /etc/resolv.conf is empty
Why I did it
Unify the Debian mirror sources
Make easy to upgrade to the next Debian release, not source url code change required.
Support to customize the Debian mirror sources during the build
Relative issue: #12523
* [openssh]: Restore behavior of ClientAliveCountMax=0
OpenSSH 8.2 changed the behavior of ClientAliveCountMax=0 such that
setting it to 0 disables connection-killing entirely when the connection
is idle. Revert that change.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
* Remove build-dep command that should not be there
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
Improve SSHD config to use more secure settings
#### Why I did it
According to Sonic OS review result, SSHD config file /etc/ssh/sshd_config using insecure settings.
#### How I did it
Change build_debian.sh script to set following settings to /etc/ssh/sshd_config:
ClientAliveInterval is set to 300
MaxAuthTries is set to default of 3
Banner set to /etc/issue
LogLevel is set to VERBOSE
#### How to verify it
Pass all E2E test case.
#### Which release branch to backport (provide reason below if selected)
<!--
- Note we only backport fixes to a release branch, *not* features!
- Please also provide a reason for the backporting below.
- e.g.
- [x] 202006
-->
- [ ] 201811
- [ ] 201911
- [ ] 202006
- [ ] 202012
- [ ] 202106
- [ ] 202111
- [ ] 202205
#### Description for the changelog
Improve SSHD config to use more secure settings
#### Link to config_db schema for YANG module changes
<!--
Provide a link to config_db schema for the table for which YANG model
is defined
Link should point to correct section on https://github.com/Azure/sonic-buildimage/blob/master/src/sonic-yang-models/doc/Configuration.md
-->
#### A picture of a cute animal (not mandatory but encouraged)
* Add k8s master feature
Signed-off-by: Yun Li <yunli1@microsoft.com>
* Update kubernetes version mistake and make variable passing clear
Signed-off-by: Yun Li <yunli1@microsoft.com>
* Add CRI-dockerd package
Signed-off-by: Yun Li <yunli1@microsoft.com>
* Update version variable passing logic
Signed-off-by: Yun Li <yunli1@microsoft.com>
* Upgrade the worker kubernetes version
Signed-off-by: Yun Li <yunli1@microsoft.com>
* Install xml file parse tool
Signed-off-by: Yun Li <yunli1@microsoft.com>
Signed-off-by: Yun Li <yunli1@microsoft.com>
#### Why I did it
The default stable version of rsyslog on bullseye has a bug about rate limit. It causes rate limit not work. The bug has been fixed on backport version 8.2206.0-1~bpo11+1.
Buster has no such issue.
#### How I did it
Upgrade rsyslog from 8.2110.0 to 8.2206.0-1~bpo11+1
#### How to verify it
Manual test
* Ported Marvell armhf build on x86 for debian buster to use cross-compilation instead of qemu emulation
Current armhf Sonic build on amd64 host uses qemu emulation. Due to the
nature of the emulation it takes a very long time, about 22-24 hours to
complete the build. The change I did to reduce the building time by
porting Sonic armhf build on amd64 host for Marvell platform for debian
buster to use cross-compilation on arm64 host for armhf target. The
overall Sonic armhf building time using cross-compilation reduced to
about 6 hours.
Signed-off-by: marvell <marvell@cpss-build3.marvell.com>
* Fixed final Sonic image build with dockers inside
* Update Dockerfile.j2
Fixed qemu-user-static:x86_64-aarch64-5.0.0-2 .
* Update cross-build-arm-python-reqirements.sh
Added support for both armhf and arm64 cross-build platform using $PY_PLAT environment variable.
* Update Makefile
Added TARGET=<cross-target> for armhf/arm64 cross-compilation.
* Reviewer's @qiluo-msft requests done
Signed-off-by: marvell <marvell@cpss-build3.marvell.com>
* Added new radius/pam patch for arm64 support
* Update slave.mk
Added missing back tick.
* Added libgtest-dev: libgmock-dev: to the buster Dockerfile.j2. Fixed arm perl version to be generic
* Added missing armhf/arm64 entries in /etc/apt/sources.list
* fix libc-bin core dump issue from xumia:fix-libc-bin-install-issue commit
* Removed unnecessary 'apt-get update' from sonic-slave-buster/Dockerfile.j2
* Fixed saiarcot895 reviewer's requests
* Fixed README and replaced 'sed/awk' with patches
* Fixed ntp build to use openssl
* Unuse sonic-slave-buster/cross-build-arm-python-reqirements.sh script (put all prebuilt python packages cross-compilation/install inside Dockerfile.j2). Fixed src/snmpd/Makefile to use -j1 in all cases
* Clean armhf cross-compilation build fixes
* Ported cross-compilation armhf build to bullseye
* Additional change for bullseye
* Set CROSS_BUILD_ENVIRON default value n
* Removed python2 references
* Fixes after merge with the upstream
* Deleted unused sonic-slave-buster/cross-build-arm-python-reqirements.sh file
* Fixed 2 @saiarcot895 requests
* Fixed @saiarcot895 reviewer's requests
* Removed use of prebuilt python wheels
* Incorporated saiarcot895 CC/CXX and other simplification/generalization changes
Signed-off-by: marvell <marvell@cpss-build3.marvell.com>
* Fixed saiarcot895 reviewer's additional requests
* src/libyang/patch/debian-packaging-files.patch
* Removed --no-deps option when installing wheels. Removed unnecessary lazy_object_proxy arm python3 package instalation
Co-authored-by: marvell <marvell@cpss-build3.marvell.com>
Co-authored-by: marvell <marvell@cpss-build2.marvell.com>
Refactors the SONiC Installer to support greater flexibility in building for a given architecture and bootloader.
#### Why I did it
Currently the SONiC installer assumes that if a platform is ARM based that it uses the `uboot` bootloader and uses the `grub` bootloader otherwise. This is not a correct assumption to make as ARM is not strictly tied to uboot and x86 is not strictly tied to grub.
#### How I did it
To implement this I introduce the following changes:
* Remove the different arch folders from the `installer/` directory
* Merge the generic components of the ARM and x86 installer into `installer/installer.sh`
* Refactor x86 + grub specific functions into `installer/default_platform.conf`
* Modify installer to call `default_platform.conf` file and also call `platform/[platform]/patform.conf` file as well to override as needed
* Update references to the installer in the `build_image.sh` script
* Add `TARGET_BOOTLOADER` variable that is by default `uboot` for ARM devices and `grub` for x86 unless overridden in `platform/[platform]/rules.mk`
* Update bootloader logic in `build_debian.sh` to be based on `TARGET_BOOTLOADER` instead of `TARGET_ARCH` and to reference the grub package in a generic manner
#### How to verify it
This has been tested on a ARM test platform as well as on Mellanox amd64 switches as well to ensure there was no impact.
#### Description for the changelog
[arm] Refactor installer and build to allow arm builds targeted at grub platforms
#### Link to config_db schema for YANG module changes
N/A
Why I did it
Support to use symbol links in platform folder to reduce the image size.
The current solution is to copy each lazy installation targets (xxx.deb files) to each of the folders in the platform folder. The size will keep growing when more and more packages added in the platform folder. For cisco-8000 as an example, the size will be up to 2G, while most of them are duplicate packages in the platform folder.
How I did it
Create a new folder in platform/common, all the deb packages are copied to the folder, any other folders where use the packages are the symbol links to the common folder.
Why platform.tar?
We have implemented a patch for it, see #10775, but the problem is the the onie use really old unzip version, cannot support the symbol links.
The current solution is similar to the PR 10775, but make the platform folder into a tar package, which can be supported by onie. During the installation, the package.tar will be extracted to the original folder and removed.
#### Why I did it
SSHD keepalive timeout feature not enabled on sonic.
#### How I did it
Enable SSHD keepalive timeout feature by set ClientAliveCountMax to 1.
#### How to verify it
Pass All E2E test case.
Manually test with following steps:
1. Change config and restart sshd
2. Connect a ssh with -vvv option to show debug message
3. Get running ssh by command and stop it:
```
azureuser@liuh-dev-vm-02:~$ ps -auxww | grep vvv
azureus+ 1614153 0.0 0.0 12244 6004 pts/1S+ 15:48 0:00 ssh admin@10.250.0.101 -vvv
azureus+ 1615570 0.0 0.0 8168 2424 pts/3S+ 15:49 0:00 grep --color=auto vvv
azureuser@liuh-dev-vm-02:~$ kill -Stop 1614153
```
4. Check TCP status from server side with ss command:
https://man7.org/linux/man-pages/man8/ss.8.html
```
admin@vlab-01:~$ ss | grep -i ssh
tcp ESTAB 0 010.250.0.101:ssh 10.250.0.1:58150
tcp FIN-WAIT-2 0 010.250.0.101:ssh 10.250.0.1:58164
tcp ESTAB 0 010.250.0.101:ssh 10.250.0.1:57978
```
FIN-WAIT-2 means server already terminate the connection and wait for client response:
https://kb.iu.edu/d/ajmi
. FIN-WAIT-2 <-- <SEQ=300><ACK=101><CTL=ACK> <-- CLOSE-WAIT
5. Check again later will show the session been complete closed:
```
admin@vlab-01:~$ ss | grep -i ssh
tcp ESTAB 0 010.250.0.101:ssh 10.250.0.1:58150
tcp ESTAB 0 010.250.0.101:ssh 10.250.0.1:57978
```
This reverts commit 15cf9b0d70.
Why I did it
Revert the PR #10775, for it has impact on onie installation.
It is caused by the symbol links not supported in some of the onie unzip.
We will enable after fixing the issue, see #10914
Why I did it
To upgrade SSD firmware in initramfs while rebooting from SONiC to SONiC and during NOS to SONiC migration.
How I did it
New option 'ssd-upgrader-part’ is introduced in grub command line, to indicate the partition and its filesystem type in which the SSD firmware updater is present. ‘ssd-upgrader-part’ syntax is ssd-upgrader-part=<partition>,<filesystem type>. Example: ssd-upgrader-part=/dev/sda8,ext4
A new initramfs script ‘ssd-upgrade’ is included in init-premount and it invokes the SSD firmware updater (ssd-fw-upgrade) present in the partition indicated by the boot option 'ssd-upgrader-part'
How to verify it
In SONiC, the SSD firmware updater is copied to “/host/” directory.
Fast-reboot is to be initiated with the ‘-u’ option ([scripts/fast-reboot] Add option to include ssd-upgrader-part boot option with SONiC partition sonic-utilities#2150)
After reboot, while booting into SONiC the SSD firmware updater will be executed in initramfs.
Why I did it
The image size is too large, when there are multiple lazy packages and multiple platforms. It is not necessary to keep the lazy installation packages in multiple copies.
For cisco image, the image size will reduce from 3.5G to 1.7G.
How I did it
Use symbol links to only keep one package for each of the lazy package.
Make a new folder fsroot/platform/common
Copy the lazy packages into the folder.
When using a package in each of the platform, such as x86_64-grub, x86_64-8800_rp-r0, x86_64-8201_on-r0, etc, only make a symbol link to the package in the common folder.
* Upgrade docker version from 20.10.7 to 20.10.14, and pin containerd.io
Update the Docker engine version from 20.10.7 to 20.10.14. This brings
in some CVE and bug fixes.
Additionally, pin the version of containerd.io to a specific version,
mainly for consistency/reproducibility.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
* Remove the containerd ordering change to docker.service
This appears to be already present in the current docker.service.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
* Remove use of apt-key
apt-key is considered deprecated, and the current practice is to just
add the key into /etc/apt/trusted.gpg.d/.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
* Upgrade docker container in Bullseye slave to 20.10.14
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
* Remove SSH host keys after installing the custom version of sshd
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
* Use an override for for sshd instead of overwriting the service file
Don't overwrite upstream's .service file, and instead use an override
file for making sure the host key(s) are generated.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
* [build]: Patch debootstrap to not unmount the host's /proc filesystem
Currently, when the final image is being built (sonic-vs.img.gz,
sonic-broadcom.bin, or similar), each invocation of sudo in the
build_debian.sh script takes 0.8 seconds to run and execute the actual
command. This is because the /proc filesystem in the slave container has
been unmounted somehow. This is happening when debootstrap is running,
and it incorrectly unmounts the host's (in our case, the slave
container's) /proc filesystem because in the new image being built,
/proc is a symlink to the host's (the slave container's) /proc. Because
of that, /proc is gone, and each invocation of sudo adds 0.8 seconds
overhead. As a side effect, docker exec into the slave container during
this time will fail, because /proc/self/fd doesn't exist anymore, and
docker exec assumes that that exists.
Debootstrap has fixed this in 1.0.124 and newer, so backport the patch
that fixes this into the version that Bullseye has.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
* [build_debian.sh]: Use eatmydata to speed up deb package installations
During package installations, dpkg calls fsync multiples times (for each
package) to ensure that tht efiles are written to disk, so that if
there's some system crash during package installation, then it is in at
least a somewhat recoverable state. For our use case though, we're
installing packages in a chroot in fsroot-* from a slave container and
then packaging it into an image. If there were a system crash (or even
if docker crashed), the fsroot-* directory would first be removed, and
the process would get restarted. This means that the fsync calls aren't
really needed for our use case.
The eatmydata package includes a library that will block/suppress the
use of fsync (and similar) system calls from applications and will
instead just return success, so that the application is not blocked on
disk writes, which can instead happen in the background instead as
necessary. If dpkg is run with this library, then the fsync calls that
it does will have no effect.
Therefore, install the eatmydata package at the beginning of
build_debian.sh and have dpkg be run under eatmydata for almost all
package installations/removals. At the end of the installation, remove
it, so that the final image uses dpkg as normal.
In my testing, this saves about 2-3 minutes from the image build time.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
* Change ln syntax to use chroot
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
Why I did it
To sign SONiC kernel image and allow secure boot based system to verify SONiC image before loading into the system.
How I did it
Pass following parameter to rules/config.user
Ex:
SONIC_ENABLE_SECUREBOOT_SIGNATURE := y
SIGNING_KEY := /path/to/key/private.key
SIGNING_CERT := /path/to/public/public.cert
How to verify it
Secure boot enabled system enrolled with right public key of the, image in the platform UEFI database will able to verify image before load.
Alternatively one can verify with offline sbsign tool as below.
export SBSIGN_KEY=/abc/bcd/xyz/
sbverify --cert $SBSIGN_KEY/public_cert.cert fsroot-platform-XYZ/boot/vmlinuz-5.10.0-8-2-amd64 mage
O/P:
Signature verification OK
Why I did it
uboot env get and set commands fw_printenv/fw_setenv are not available in bullseye sonic image. Some platforms using them where failing. Ex: sonic-installer commands in marvell-armhf.
In case of buster, u-boot-tools was providing these commands.
How I did it
Added libubootenv-tool which provides these tools along with other uboot tools in build_debian.sh.
How to verify it
root@localhost:# fw_printenv serverip
serverip=10.4.50.39
root@localhost:# fw_setenv serverip 10.4.50.38
root@localhost:~# fw_printenv serverip
serverip=10.4.50.38
Change-Id: I558f8737f41d83d3e8527ce340391ae8f978b6d8
Signed-off-by: Pavan Naregundi <pnaregundi@marvell.com>
PR #9481 changed auditd's log directory to be /var/log instead of
/var/log/audit, because SONiC mounts a disk image at /var/log during
runtime, and so the /var/log/audit directory might not exist (since it
would've been created during package installation, mounting another
partition at /var/log will hide it). However, for security reasons,
auditd changes the log directory to have 0750 permissions, so that not
everyone knows about the audit logs or read them.
To fix this, revert the change to auditd's log directory, and tell
systemd to create the audit log directory at runtime if it doesn't
exist. Because the disk image gets mounted during initramfs (before
systemd starts), systemd will make sure that the /var/log/audit
directory will exist.
Fixes#9548 and #10015
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
Since ++ is treated as a regex by apt-get, make sure the development
headers and the Java bindings for grpc don't get installed as well.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
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#### Why I did it
1. Fix auditd log file path, because known issue: https://github.com/Azure/sonic-buildimage/issues/9548
2. When SONiC change to based on bullseye, auditd version upgrade from 2.8.4 to 3.0.2, and in auditd 3.0.2 the plugin file path changed to /etc/audit/plugins.d, however the upstream auditisp-tacplus project not follow-up this change, it still install plugin config file to /etc/audit/audisp.d. so the plugin can't be launch correctly, the code change in src/tacacs/audisp/patches/0001-Porting-to-sonic.patch fix this issue.
#### How I did it
Fix tacacs plugin config file path.
Create /var/log/audit folder for auditd.
#### How to verify it
Pass all UT, also run per-command acccounting UT to validate plugin loaded.
#### Which release branch to backport (provide reason below if selected)
<!--
- Note we only backport fixes to a release branch, *not* features!
- Please also provide a reason for the backporting below.
- e.g.
- [x] 202006
-->
- [ ] 201811
- [ ] 201911
- [ ] 202006
- [ ] 202012
- [ ] 202106
#### Description for the changelog
<!--
Write a short (one line) summary that describes the changes in this
pull request for inclusion in the changelog:
-->
Fix tacacs plugin config file path.
Create /var/log/audit folder for auditd.
#### A picture of a cute animal (not mandatory but encouraged)
This pull request integrate audisp-tacplus to SONiC for per-command accounting.
#### Why I did it
To support TACACS per-command accounting, we integrate audisp-tacplus project to sonic.
#### How I did it
1. Add auditd service to SONiC
2. Port and patch audisp-tacplus to SONiC
#### How to verify it
UT with CUnit to cover all new code in usersecret-filter.c
Also pass all current UT.
#### Which release branch to backport (provide reason below if selected)
N/A
#### Description for the changelog
Add audisp-tacplus for per-command accounting.
#### A picture of a cute animal (not mandatory but encouraged)
Python 2 is no longer available, so remove those packages, and remove
the pip2 commands. For picocom and systemd, just install from the
regular repo, since there's no backports yet.
Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>
#### Why I did it
Nokia IXR7250E platform requires grpcio, grpcio-tools python library, and libprotobuf-dev, libgrpc++ library
#### How I did it
Modified the build_debian.sh install libprotobuf-dev and libgrpc++ to support nokia ndk
Modified the sonic_debian_extension.j2 to install the grpcio and grpcio-tools in the host
Modified the docker-platform-monitor/Dockerfile.js to install grpcio and grpcio-tools for the pmon container.
#### How to verify it
Image running success.
the branch refers the branch name that the commit is in,
for example master, 202012, 201911, ...
In case there is no branch, the name will be HEAD.
release is encoded in /etc/sonic/sonic_release file.
the file is only available for a release branch.
It is not available in master branch.
example for master branch
```
build_version: 'master.602-6efc0a88'
debian_version: '10.7'
kernel_version: '4.19.0-9-2-amd64'
asic_type: vs
commit_id: '6efc0a88'
branch: 'master'
release: 'none'
build_date: Tue Dec 29 06:54:02 UTC 2020
build_number: 602
built_by: johnar@jenkins-worker-23
```
example for 202012 release branch
```
build_version: '202012.602-6efc0a88'
debian_version: '10.7'
kernel_version: '4.19.0-9-2-amd64'
asic_type: vs
commit_id: '6efc0a88'
branch: '202012'
release: '202012'
build_date: Tue Dec 29 06:54:02 UTC 2020
build_number: 602
built_by: johnar@jenkins-worker-23
```
Signed-off-by: Guohan Lu <lguohan@gmail.com>
#### Why I did it
- To build flashrom properly with dependency tracking.
#### How I did it
- Moved flashrom code from platform/broadcom/sonic-platform-modules-dell/tools directory to src/flashrom directory.
- At the end, flashrom_0.9.7_amd64.deb package is build which will be installed in the devices.
- Currently flashrom builds only for Dell S6100 platforms.
#### Why I did it
To allow SSH connections from IPv6 addresses
Resolves https://github.com/Azure/sonic-buildimage/issues/7668
#### How I did it
In build_debian.sh, modify sshd_config file so as to enable listening for IPv6 connections
Why I did it
The SONiC switches get their docker images from local repo, populated during install with container images pre-built into SONiC FW. With the introduction of kubernetes, new docker images available in remote repo could be deployed. This requires dockerd to be able to pull images from remote repo.
Depending on the Switch network domain & config, it may or may not be able to reach the remote repo. In the case where remote repo is unreachable, we could potentially make Kubernetes server to also act as http-proxy.
How I did it
When admin explicitly enables, the kubernetes-server could be configured as docker-proxy. But any update to docker-proxy has to be via service-conf file environment variable, implying a "service restart docker" is required. But restart of dockerd is vey expensive, as it would restarts all dockers, including database docker.
To avoid dockerd restart, pre-configure an http_proxy using an unused IP. When k8s server is enabled to act as http-proxy, an IP table entry would be created to direct all traffic to the configured-unused-proxy-ip to the kubernetes-master IP. This way any update to Kubernetes master config would be just manipulating IPTables, which will be transparent to all modules, until dockerd needs to download from remote repo.
How to verify it
Configure a switch such that image repo is unreachable
Pre-configure dockerd with http_proxy.conf using an unused IP (e.g. 172.16.1.1)
Update ctrmgrd.service to invoke ctrmgrd.py with "-p" option.
Configure a k8s server, and deploy an image for feature with set_owner="kube"
Check if switch could successfully download the image or not.
- Why I did it
To give SONiC Application Extension developers an environment to run and develop their apps.
- How I did it
Created sonic-sdk and sonic-sdk-buildenv dockers and their dbg versions.
- How to verify it
Build:
$ make -f slave target/sonic-sdk.gz target/sonic-sdk-buildenv.gz
PR# 7249 introduced a new bit of logic _after_ the point where the qemu based
build environment for ARM is removed. Hence the new logic fails when building
for ARM. Builds for AMD64 were not affected.
This commit moves the new logic introduced by PR# 7249 to just _before_ the
point where the qemu based build environment for ARM is removed. A comment is
added to reduce the likelihood of this sort of ARM build break from happening
again.
#### Why I did it
To build flashrom properly with dependency tracking.
#### How I did it
Moved flashrom code from platform/broadcom/sonic-platform-modules-dell/tools directory to src/flashrom directory.
At the end, flashrom_0.9.7_amd64.deb package is build which will be installed in the devices.
- Support compile sonic arm image on arm server. If arm image compiling is executed on arm server instead of using qemu mode on x86 server, compile time can be saved significantly.
- Add kernel argument systemd.unified_cgroup_hierarchy=0 for upgrade systemd to version 247, according to #7228
- rename multiarch docker to sonic-slave-${distro}-march-${arch}
Co-authored-by: Xianghong Gu <xgu@centecnetworks.com>
Co-authored-by: Shi Lei <shil@centecnetworks.com>
