sonic-buildimage/files/image_config/interfaces
Hua Liu 164916681a
Fix can't access IPV6 address via management interface because 'default' route table does not add to route lookup issue. (#17281)
Fix can't access IPV6 address via management interface because 'default' route table does not add to route lookup issue.

#### Why I did it
When device set with IPV6 TACACS server address, and shutdown all BGP, device can't connect to TACACS server via management interface.

After investigation, I found the IPV6 'default' route table does not add to route lookup:

admin@vlab-01:~$ ip -6 rule list
1001:   from all lookup local
32765:  from fec0::ffff:afa:1 lookup default
32766:  from all lookup main
admin@vlab-01:~$

As compare:
admin@vlab-01:~$ ip -4 rule list
1001:   from all lookup local
32764:  from all to 172.17.0.1/24 lookup default
32765:  from 10.250.0.101 lookup default
32766:  from all lookup main
32767:  from all lookup default <== 'default' route table exist in IPV4 route lookup

Issue fix by add 'default' route table to route lookup with following command:
admin@vlab-01:~$ sudo ip -6 rule add pref 32767 lookup default
admin@vlab-01:~$ ip -6 rule list
1001:   from all lookup local
32765:  from fec0::ffff:afa:1 lookup default
32766:  from all lookup main
32767:  from all lookup default <== 'default' route table been added to IPV6 route lookup
admin@vlab-01:~$

##### Work item tracking
- Microsoft ADO: 25798732

#### How I did it
When management interface using 'default' route table, add 'default' route table to IPV6 route lookup.

#### How to verify it
Pass all UT.
Add new UT to cover this change.
Manually verify issue fixed:

### Tested branch (Please provide the tested image version)

- [x]  master-17281.417570-2133d58fa

#### Description for the changelog
Fix can't access IPV6 address via management interface because 'default' route table does not add to route lookup issue.
2023-12-05 11:51:56 -08:00
..
init_interfaces [sonic boot] disable dhcp during boot up, until updategraph service is running (#2316) 2018-11-29 08:34:22 -08:00
interfaces-config.service [services] introduce sonic.target (#5705) 2021-02-25 14:26:24 +02:00
interfaces-config.sh [dns] Add support for static DNS configuration. (#14549) 2023-06-22 19:12:30 +03:00
interfaces.j2 Fix can't access IPV6 address via management interface because 'default' route table does not add to route lookup issue. (#17281) 2023-12-05 11:51:56 -08:00