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What did you set the MTU to? IIRC for AES128+SHA1 it needs to be 1387, so you would need something smaller than that to prevent fragmentation. I did a few minutes googling but didnt find a definitive answer. As a guess, maybe 256-160 = 96 bits (SHA1 is 160 bits, SHA256 is 256 bits), so dividing by 8 to get bytes is 12, so maybe 1375?
Other than that, TCP gets slower as latency rises, so you might need to increase the TCP window size if the latency is high.
I remember scp/sftp being slow without the HPN patches, but that was many years ago.
Setting mss on the policies to 1350 helps sometimes.
Don't guess do a path mtu ping and then adjust afterwards
ping -f -l 1488 x.x.x.x
Adjust downwards until the packet needs fragmentation errors goes away
Ken Felix
PCNSE
NSE
StrongSwan
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