From: Alexey Kodanev <alexey.koda...@oracle.com> Date: Tue, 19 Dec 2017 16:59:21 +0300
> LTP/udp6_ipsec_vti tests fail when sending large UDP datagrams over > ip6_vti that require fragmentation and the underlying device has an > MTU smaller than 1500 plus some extra space for headers. This happens > because ip6_vti, by default, sets MTU to ETH_DATA_LEN and not updating > it depending on a destination address or link parameter. Further > attempts to send UDP packets may succeed because pmtu gets updated on > ICMPV6_PKT_TOOBIG in vti6_err(). > > In case the lower device has larger MTU size, e.g. 9000, ip6_vti works > but not using the possible maximum size, output packets have 1500 limit. > > The above cases require manual MTU setup after ip6_vti creation. However > ip_vti already updates MTU based on lower device with ip_tunnel_bind_dev(). > > Here is the example when the lower device MTU is set to 9000: ... > Reported-by: Petr Vorel <pvo...@suse.cz> > Signed-off-by: Alexey Kodanev <alexey.koda...@oracle.com> Applied, thanks Alexey.
