SatSig topic:

MTU Problem on HUB

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Oct 8^th, 2009 at 11:28am

Does anyone having experience with MTU problem on HUB, i have VPN using FO connected to HUB and then to VSAT.
when i traceroute from the HQ to the VSAT , MTU is occured. below is my traceroute :

root@yaris:/> traceroute 10.171.36.224
trying to get source for 10.171.36.224
source should be 192.168.12.55
traceroute to 10.171.36.224 (10.171.36.224) from 192.168.12.55
(192.168.12.55), 30 hops max
outgoing MTU = 1500
1 10.24.32.11 (10.24.32.11) 2 ms 1 ms 1 ms
2 10.24.1.30 (10.24.1.30) 2 ms 2 ms 2 ms
3 10.12.1.30 (10.12.1.30) 2 ms 2 ms 2 ms
4 10.8.1.1 (10.8.1.1) 2 ms 2 ms 2 ms
5 10.130.5.1 (10.130.5.1) 5 ms 5 ms 5 ms
6 192.168.152.6 (192.168.152.6) 8 ms 7 ms 8 ms
7 172.24.31.101 (172.24.31.101) 9 ms 9 ms 9 ms
8 172.24.31.101 (172.24.31.101) 9 ms
fragmentation required, trying new MTU = 1492
8 9 ms
fragmentation required, trying new MTU = 1480
8 9 ms
fragmentation required, trying new MTU = 1472
8 9 ms
fragmentation required, trying new MTU = 1006
8 10.200.88.141 (10.200.88.141) 1254 ms 580 ms 576 ms
9 10.171.36.224 (10.171.36.224) 567 ms 564 ms 1238 ms

any answer will be helpfull...

Regard,
mahrus

Oct 8^th, 2009 at 4:13pm

Most probably your VPN is set up wrong. Do clients have automatic MTU discovery? Because VPN introduces some protocol overhead you have to make sure the outgoing packets, combined with the VPN overhead, would not exceed the maximum MTU the network can handle.

Sorry I can't advise anything particular as I don't know particulars about your setup.

Oct 9^th, 2009 at 9:47am

okay ill check the configuration of the VPN since it handle by different division i have to confirm to get the config.
meanwhile ill check the problem toward... ill traceroute from the VSAT to the HQ and will see does MTU problem also occured on this one.

thanks for ur quick reply

Regard
mahrus