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How To Tell If Fragmented Packets Are Traversing the VPN Tunnel

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Article ID: KB14838 KB Last Updated: 22 Jun 2010Version: 4.0
Summary:
How To Tell If Fragmented Packets Are Traversing the VPN Tunnel
Symptoms:
I need to know if there are fragmented packets traversing a VPN.  Is there an command that will show this?
Solution:
The command 'get sa stat' returns the following output:

ssg550(M)-> get sa stat
total configured sa: 2
HEX ID    Gateway     Fragment  Auth-Fail  Other  Totalbytes
00000001< 10.10.10.1  0         0          0      2451986837
00000001> 10.10.10.1  1357371   0          0      1254691608

The number of fragmented packets is reported in the Fragment column.  In this example, 1,357,371 packets on the egress side of the VPN were fragmented.
For additional information, also refer to KB4896.



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