From: Peter Bieringer <pb@bieringer.de>
To: Maillist netdev <netdev@oss.sgi.com>
Subject: IPv6 MTU of a tunnel: 2 different switches, which wins?
Date: Mon, 02 Sep 2002 09:10:19 +0200 [thread overview]
Message-ID: <10010000.1030950619@localhost> (raw)
Hi,
sure here anyone can help me:
Let's say I have an internet connection via PPPoE through ppp0/eth1
MTU eth1: 1500
MTU ppp0: 1492
Over this connection, an IPv6 (named tun6to4) tunnel will be
established. Now I have 2 different switches to adjust the MTU of the
tunnel.
a) using utility ip
b) using sysctl
After unmodified MTU setup:
a)
# ip link show dev tun6to4 | grep -w mtu
42: tun6to4@NONE: <NOARP,UP> mtu 1480 qdisc noqueue
b)
# sysctl -a| grep tun6to4 | grep mtu
net.ipv6.conf.tun6to4.mtu = 1480
But proper MTU will be
MTU tun6to4: 1472 MTU(ppp0) - 20 for IPv4 header
where to proper set now?
1) via ip
2) via sysctl in net.ipv6.conf.tun6to4.mtu
3) both switches
BTW: host should act either as router or standalone.
Thanks for any clarifies,
Peter
---
Dr. Peter Bieringer
mailto: pb at bieringer dot de
http://www.bieringer.de/pb/
Key 0x958F422D : B501 24F4 9418 23E2 C0F3 F833 7B57 AA7B 958F 422D
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