Hello,
we are running two Astaro Firewall (both Release 7.507) which haves a VPN Site-2-Site connection which is running for years. Last week (which 7.506 or 7.505) we had the problem that all in sudden the VPN connection from one computer to another (but not in the other direction) became "unstable". Small files passed throught, larger files were stalling. I "solved" it by changing the policy to AES256, which I am using usualy anyway.
Today we were facing the same problem. I noticed that files as little as 1305 bytes will be transferred, a file of 1306 bytes will be not transferred (tried to do "scp" under linux). Now I reduced the MTU on both machines to 1300, and everything works fine..
But why? We did not change anything on our network system and other IP Secs (also Astaro) connected to both machines were working fine...
? Any ideas?
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