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could someone advice me how to determine the value for "ipsec.replay_counter_window_size"

could someone direct me how I can adjust the setting to avoid VPN Tunnel termination due to "possible replay attack".

I do have the issue described in sk94984. The issue exists only for one Tunnel. The issue is gone when I disable the replay check. Now I wanted to turn it back on and adjust the window size. In the SK they only say to adjust it to the relevant value.

In the logs I do have the message:

Warning: possible replay attack. Sequence Number 1490945 (Expected 1491179)

Currently I used 1200 as window size but the tunnel is still being terminated.


How can I determine / calculate the value? Seem that it isn’t just 1491179-1490945


R80.40 T94

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