Bug 67951

Summary:	No reply after loopback down-up
Product:	Networking	Reporter:	Weilong Chen (chenweilong)
Component:	IPV6	Assignee:	Hideaki YOSHIFUJI (yoshfuji)
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	alan, hannes, jirislaby
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.13.0-rc4	Subsystem:
Regression:	No	Bisected commit-id:

Description Weilong Chen 2013-12-30 12:12:52 UTC

kernel:3.13.0-rc4

I did a test like this:
On host1:
1)ifconfig eth0 add fd00::3
On host2:
1)ifconfig eth0 add fd00::4
2)ping6 fd00::3

Everything went OK.

Then:
On host1:
1)ifconfig lo down;ifconfig lo up
On hsot2:
1)ping6 fd00::3

There was no reply from host1!

Comment 1 hannes 2013-12-31 01:51:24 UTC

Thank you for the report!

This was first fixed with 25fb6ca4ed9cad72f14f61629b68dc03c0d9713f ("net IPv6 : Fix broken IPv6 routing table after loopback down-up") and broken again in a881ae1f625c599b460cc8f8a7fcb1c438f699ad ("ipv6: don't call addrconf_dst_alloc again when enable lo").

You could fix this by adding the local route again:

ip -6 r a local fd00::3 dev lo

I hope I can come up with a fix shortly.

Comment 2 Weilong Chen 2013-12-31 05:56:48 UTC

It works good,thanks!

Comment 3 Alan 2014-01-15 11:34:49 UTC

sorry closed wrong bug number

Comment 4 Weilong Chen 2014-01-26 09:45:40 UTC

fixed

Comment 5 Jiri Slaby 2015-04-07 12:46:43 UTC

33d99113b1102c2d2f8603b9ba72d89d915c13f5