Thanks Jesse,
This is plain vanilla when all MTU left at default. Dmesg showing
[ 752.962014] openvswitch: vnet5: dropped over-mtu packet: 1502 > 1500
[ 752.962027] openvswitch: inter-1tom: dropped over-mtu packet: 1502 > 1500
* 10.128.0.12 is the VM on the virtual side
The others are the internet hosts
23.36.60.124 is apple.com trying to send it 1500Byte packets.
It stalls as I get the 1502 message in dmesg.
h# ovs-appctl dpif/dump-flows switch-1
recirc_id(0),skb_priority(0),in_port(5),eth(src=20:e5:2a:07:0d:cf,dst=52:54:00:3d:a6:db),eth_type(0x0800),ipv4(src=23.36.60.124/255.255.255.255,dst=10.128.0.12/255.255.255.255,proto=6/0xff,tos=0x8/0,ttl=55/0,frag=no/0xff),
packets:22, bytes:26040, used:1.388s, flags:SFP., actions:15,13
recirc_id(0),skb_priority(0),in_port(15),eth(src=52:54:00:3d:a6:db,dst=20:e5:2a:07:0d:cf),eth_type(0x0800),ipv4(src=10.128.0.12/255.255.255.255,dst=23.56.123.171/255.255.255.255,proto=6/0xff,tos=0/0,ttl=128/0,frag=no/0xff),
packets:0, bytes:0, used:never, actions:5,13
recirc_id(0),skb_priority(0),in_port(5),eth(src=20:e5:2a:07:0d:cf,dst=52:54:00:3d:a6:db),eth_type(0x0800),ipv4(src=172.230.227.22/255.255.255.255,dst=10.128.0.12/255.255.255.255,proto=6/0xff,tos=0/0,ttl=57/0,frag=no/0xff),
packets:0, bytes:0, used:never, actions:15,13
recirc_id(0),skb_priority(0),in_port(5),eth(src=20:e5:2a:07:0d:cf,dst=52:54:00:3d:a6:db),eth_type(0x0800),ipv4(src=23.56.123.171/255.255.255.255,dst=10.128.0.12/255.255.255.255,proto=6/0xff,tos=0/0,ttl=57/0,frag=no/0xff),
packets:0, bytes:0, used:never, actions:15,13
recirc_id(0),skb_priority(0),in_port(5),eth(src=20:e5:2a:07:0d:cf,dst=ff:ff:ff:ff:ff:ff),eth_type(0x0800),ipv4(src=10.128.0.1/255.255.255.255,dst=255.255.255.255/255.255.255.255,proto=17/0xff,tos=0/0,ttl=64/0,frag=no/0xff),udp(src=32772/0x8000,dst=7423/0xf000),
packets:0, bytes:0, used:never, actions:13
root@jwu-lenovo:/var/run/openvswitch# ovs-appctl dpif/show
system@ovs-system: hit:8304 missed:1447
control-switch:
control-switch 65534/2: (internal)
vnet0 1/6: (system)
vnet1 2/8: (system)
vnet3 3/10: (system)
mirror-switch:
inter-mto1 2/14: (system)
mirror-port 1/11: (system)
mirror-switch 65534/1: (internal)
switch-1:
control-proxy-1 3/7: (system)
inter-1tom 6/13: (system)
svc-port-1 2/3: (internal)
switch-1 65534/4: (internal)
vmnic1 1/5: (system)
vnet2 4/9: (system)
vnet4 5/12: (system)
vnet5 7/15: (system)
root@jwu-lenovo:/var/run/openvswitch#
-----Original Message-----
From: Jesse Gross [mailto:je...@nicira.com]
Sent: Wednesday, June 24, 2015 11:06 AM
To: Johnson L. Wu
Cc: Emil Flink; discuss@openvswitch.org
Subject: Re: [ovs-discuss] Running into MTU problem (2 extra bytes)
On Wed, Jun 24, 2015 at 10:34 AM, Johnson L. Wu <john...@snoopy.org> wrote:
>
> Hi Jesse,
>
> I just checked to see if there's any vlan related settings in my OVS that
> might get it to insert a tag and I found nothing.
> I have a funny feeling that *might* be Debian 8 related vs OVS 2.3 (I am now
> using 2.3.2). An old Wheezy machine using OVS OVS 1.11.1 doesnt have this
> problem when I compare them side-by-side.
Hmm, thanks for looking. I did notice that both of you are running Debian 8. I
guess trying the Linux bridge is still the easiest check to make. One other
thing: can you try running ovs-appctl dpif/dump-flows <BR> while the problem is
occurring and post the output?
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