Thanks Florin,
it works with offload disabled, earlier when i tried changing
offload settings i missed doing it on one machine.
However my question is still about why VPP is unable to handle it, is
it a missing configuration or missing functionality in VPP?
i can ssh from one vm to another without turning off offload while
using linux bridge, and i don't see any change in the packet as well
after being forwarded. Though tcpdump complains about checksum, but
everything works fine.
packet ingressing into linux bridge from vm-1
06:41:58.626869 02:53:71:ef:2f:2a > 02:91:fb:46:9e:43, ethertype IPv4
(0x0800), length 74: (tos 0x0, ttl 64, id 6341, offset 0, flags [DF],
proto TCP (6), length 60)
1.1.1.3.51912 > 1.1.1.4.22: Flags [S], cksum 0x0437 (incorrect ->
0xdeae), seq 2306393024, win 29200, options [mss 1460,sackOK,TS val
1825541 ecr 0,nop,wscale 7], length 0
0x0000: 0291 fb46 9e43 0253 71ef 2f2a 0800 4500
0x0010: 003c 18c5 4000 4006 1def 0101 0103 0101
0x0020: 0104 cac8 0016 8978 c3c0 0000 0000 a002
0x0030: 7210 0437 0000 0204 05b4 0402 080a 001b
0x0040: db05 0000 0000 0103 0307
packet egressing from linux bridge to vm-2
06:41:58.627130 02:53:71:ef:2f:2a > 02:91:fb:46:9e:43, ethertype IPv4
(0x0800), length 74: (tos 0x0, ttl 64, id 6341, offset 0, flags [DF],
proto TCP (6), length 60)
1.1.1.3.51912 > 1.1.1.4.22: Flags [S], cksum 0x0437 (incorrect ->
0xdeae), seq 2306393024, win 29200, options [mss 1460,sackOK,TS val
1825541 ecr 0,nop,wscale 7], length 0
0x0000: 0291 fb46 9e43 0253 71ef 2f2a 0800 4500
0x0010: 003c 18c5 4000 4006 1def 0101 0103 0101
0x0020: 0104 cac8 0016 8978 c3c0 0000 0000 a002
0x0030: 7210 0437 0000 0204 05b4 0402 080a 001b
0x0040: db05 0000 0000 0103 0307
Regards,
Prabhjot
Quoting Florin Coras <fcoras.li...@gmail.com>:
Hi Prabhjot,
From your description, I suspect it may be a linux tcp checksum
offload issue. Could you try disabling it for all interfaces with:
ethtool --offload <iface_name> rx off tx off
Hope this helps,
Florin
On Aug 28, 2017, at 10:56 AM, Prabhjot Singh Sethi
<prabh...@techtrueup.com> wrote:
We have been trying to use VPP as a L2/L3 forwarding data path between VMs.
where we have connected tap interfaces from VM to VPP using "create
host-interface name <name>"
after adding both the interfaces to same bridge-domain (bd_id = 2),
we are able to ping from
one VM to another (both in same subnet). However when we try to do
ssh we observe that all the
tcp packets are transmitted/forwarded by VPP to the other end but
they are dropped as
"bad segments received".
Can anyone help with what could be wrong here, are we missing any
other required config?
Note:- same VMs works well when connected to linux bridge
root@vm-2:~# netstat -s | grep -A11 -i tcp:
Tcp:
33 active connections openings
4 passive connection openings
0 failed connection attempts
1 connection resets received
1 connections established
885 segments received
650 segments send out
8 segments retransmited
19 bad segments received. <<<<<<<<<<<<<<<<<<<< Keeps
increasing for every tcp packet
2 resets sent
InCsumErrors: 19 <<<<<<<<<<<<<<<<<<<< Keeps
increasing for every tcp packet
root@vm-2:~#
Regards,
Prabhjot
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