netdev - Re: Bonding driver unexpected behaviour

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Date:   Thu, 16 Jul 2020 09:08:38 +0200
From:   "Riccardo Paolo Bestetti" <pbl@...tov.io>
To:     "Zhu Yanjun" <zyjzyj2000@...il.com>
Cc:     "netdev" <netdev@...r.kernel.org>
Subject: Re: Bonding driver unexpected behaviour

Hello Zhu Yanjun,
 
On Thursday, July 16, 2020 05:41 CEST, Zhu Yanjun <zyjzyj2000@...il.com> wrote: 

> 
> Please check this
> https://developers.redhat.com/blog/2019/05/17/an-introduction-to-linux-virtual-interfaces-tunnels/#gre
> 
> Perhaps gretap only forwards ip (with L2 header) packets.

That does not seem to be the case.
E.g.
root@...exit:/home/user# tcpdump -i intra16
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on intra16, link-type EN10MB (Ethernet), capture size 262144 bytes
09:05:12.619206 IP 10.88.16.100 > 10.88.16.200: GREv0, length 46: ARP, Request who-has 10.42.42.200 tell 10.42.42.100, length 28
09:05:12.619278 IP 10.88.16.200 > 10.88.16.100: GREv0, length 46: ARP, Reply 10.42.42.200 is-at da:9d:34:64:cb:8d (oui Unknown), length 28
09:05:14.054026 IP 10.88.16.200 > 10.88.16.100: GREv0, length 46: ARP, Request who-has 10.42.42.100 tell 10.42.42.200, length 28
09:05:14.107143 IP 10.88.16.100 > 10.88.16.200: GREv0, length 46: ARP, Reply 10.42.42.100 is-at d6:49:e5:19:52:16 (oui Unknown), length 28
^C

> 
> Possibly "arp -s" could help to workaround this.

Riccardo P. Bestetti