Hello,

I'm running a gif(4) IPv4 tunnel over a pppoe(4) line. I can sent
ICMP packets over the connection but every TCP connection is
reseted after the connection has been established:

15:46:29.210696 PPPoE  [ses 0x4b2] tunnel.ser.ver > my.dyn.ip: beaver.core.de.51001 > colwyn.zhadum.de.daytime: S [tcp sum ok] 2326402180:2326402180(0) win 16384 <mss 1460,nop,wscale 0,nop,nop,timestamp 11067332 0> (ttl 52, id 31375, len 60) (DF) (ttl 42, id 0, len 80)
15:46:29.210960 PPPoE  [ses 0x4b2] my.dyn.ip > tunnel.ser.ver: colwyn.zhadum.de.daytime > beaver.core.de.51001: S [tcp sum ok] 3582484936:3582484936(0) ack 2326402181 win 16384 <mss 1240,nop,wscale 0,nop,nop,timestamp 0 11067332> (ttl 64, id 31076, len 60) (ttl 30, id 25722, len 80)
15:46:29.335905 PPPoE  [ses 0x4b2] tunnel.ser.ver > my.dyn.ip: beaver.core.de.51001 > colwyn.zhadum.de.daytime: . [tcp sum ok] ack 1 win 17520 <nop,nop,timestamp 11067333 0> (ttl 52, id 31376, len 52) (DF) (ttl 42, id 0, len 72)
15:46:29.336028 PPPoE  [ses 0x4b2] my.dyn.ip > tunnel.ser.ver: colwyn.zhadum.de.daytime > beaver.core.de.51001: R [tcp sum ok] 3582484937:3582484937(0) win 0 (ttl 64, id 33124, len 40) (ttl 30, id 25730, len 60)

Does anybody have an idea why this is happening?

	Kind regards

-- 
Matthias Scheler                                  http://scheler.de/~matthias/