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From: mastertheknife <mastertheknife@gmail.com>
To: David Ahern <dsahern@gmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: PMTUD broken inside network namespace with multipath routing
Date: Fri, 14 Aug 2020 10:08:30 +0300	[thread overview]
Message-ID: <CANXY5yKW=+e1CsoXCb0p_+6n8ZLz4eoOQz_5OkrrjYF6mpU9ZQ@mail.gmail.com> (raw)
In-Reply-To: <962617e5-9dec-6715-d550-4cf3ee414cf6@gmail.com>

Hello David,

It's on a production system, vmbr2 is a bridge with eth.X VLAN
interface inside for the connectivity on that 252.0/24 network. vmbr2
has address 192.168.252.5 in that case
192.168.252.250 and 192.168.252.252 are CentOS8 LXCs on another host,
with libreswan inside for any/any IPSECs with VTi interfaces.

Everything is kernel 5.4.44 LTS

I wish i could fully reproduce all of it in a script, but i am not
sure how to create such hops that return this ICMP

Thank you,
Kfir


On Wed, Aug 12, 2020 at 10:21 PM David Ahern <dsahern@gmail.com> wrote:
>
> On 8/12/20 6:37 AM, mastertheknife wrote:
> > Hello David,
> >
> > I tried and it seems i can reproduce it:
> >
> > # Create test NS
> > root@host:~# ip netns add testns
> > # Create veth pair, veth0 in host, veth1 in NS
> > root@host:~# ip link add veth0 type veth peer name veth1
> > root@host:~# ip link set veth1 netns testns
> > # Configure veth1 (NS)
> > root@host:~# ip netns exec testns ip addr add 192.168.252.209/24 dev veth1
> > root@host:~# ip netns exec testns ip link set dev veth1 up
> > root@host:~# ip netns exec testns ip route add default via 192.168.252.100
> > root@host:~# 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@host:~# 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

  reply	other threads:[~2020-08-14  7:08 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-03 11:14 mastertheknife
2020-08-03 13:32 ` David Ahern
2020-08-03 14:24   ` mastertheknife
2020-08-03 15:38     ` David Ahern
2020-08-03 18:39       ` mastertheknife
2020-08-10 22:13         ` David Ahern
2020-08-12 12:37           ` mastertheknife
2020-08-12 19:21             ` David Ahern
2020-08-14  7:08               ` mastertheknife [this message]
2020-09-01 10:40                 ` mastertheknife
2020-09-01 10:44                   ` mastertheknife
2020-09-02  0:42                   ` David Ahern

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