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Re: [Openvpn-users] Re: MTU problem?


  • Subject: Re: [Openvpn-users] Re: MTU problem?
  • From: Martijn Lievaart <m@xxxxxxx>
  • Date: Sat, 22 Jan 2005 17:11:43 +0100

Jochen Witte wrote:

interenal interface

[root@host root]# tethereal host 10.128.0.10
Capturing on eth0
 0.000000 192.168.0.67 -> 10.128.0.10  TCP 32939 > ssh [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460
 0.101004  10.128.0.10 -> 192.168.0.67 TCP ssh > 32939 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1118
 2.372124  10.128.0.10 -> 192.168.0.67 TCP ssh > 32938 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1118
 2.999637 192.168.0.67 -> 10.128.0.10  TCP 32939 > ssh [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460
 3.097806  10.128.0.10 -> 192.168.0.67 TCP ssh > 32939 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1118
 3.170076  10.128.0.10 -> 192.168.0.67 TCP ssh > 32939 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1118


tun interface

[root@firefly root]# tethereal -i tun0 host 10.128.0.10
tethereal: WARNING: arptype 65534 not supported by libpcap - falling back to cooked socket.
Capturing on tun0
 0.000000 192.168.0.67 -> 10.128.0.10  TCP 32940 > ssh [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460
 0.100753  10.128.0.10 -> 192.168.0.67 TCP ssh > 32940 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1118
 0.149312  10.128.0.10 -> 192.168.0.67 TCP ssh > 32939 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1118
 2.999361 192.168.0.67 -> 10.128.0.10  TCP 32940 > ssh [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460
 3.000710 192.168.0.67 -> 10.128.0.10  TCP 32940 > ssh [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460
 3.003071 192.168.0.67 -> 10.128.0.10  TCP 32940 > ssh [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460




Something on or between firefly and 192.168.0.67 blocks or discards the SYN ACK. Routing or firewall?


M4


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