netdev - Re: PMTUD broken inside network namespace with multipath routing

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Message-ID: <962617e5-9dec-6715-d550-4cf3ee414cf6@gmail.com>
Date:   Wed, 12 Aug 2020 13:21:31 -0600
From:   David Ahern <dsahern@...il.com>
To:     mastertheknife <mastertheknife@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: PMTUD broken inside network namespace with multipath routing

On 8/12/20 6:37 AM, mastertheknife wrote:
> Hello David,
> 
> I tried and it seems i can reproduce it:
> 
> # Create test NS
> root@...t:~# ip netns add testns
> # Create veth pair, veth0 in host, veth1 in NS
> root@...t:~# ip link add veth0 type veth peer name veth1
> root@...t:~# ip link set veth1 netns testns
> # Configure veth1 (NS)
> root@...t:~# ip netns exec testns ip addr add 192.168.252.209/24 dev veth1
> root@...t:~# ip netns exec testns ip link set dev veth1 up
> root@...t:~# ip netns exec testns ip route add default via 192.168.252.100
> root@...t:~# ip netns exec testns ip route add 192.168.249.0/24
> nexthop via 192.168.252.250 nexthop via 192.168.252.252
> # Configure veth0 (host)
> root@...t:~# brctl addif vmbr2 veth0

vmbr2's config is not defined.

ip li add vmbr2 type bridge
ip li set veth0 master vmbr2
ip link set veth0 up

anything else? e.g., address for vmbr2? What holds 192.168.252.250 and
192.168.252.252