We had made ssl and ipsec vpn tunnel on gigabit interfaces and then measured throughput. It was less than ~130 Mbps.
Who knows does Astaro limit ssl or ipsec vpn tunnels throughput?
In the 'Remote Gateway' definition 'Advanced' section, select 'Support Path MTU discovery'. Make this setting on both sides of the site-to-site tunnel.
If there is a switch between the two Astaros, you may need to lower the MTU of the interfaces - try 1400 just to see if there's a difference.
In the 'Remote Gateway' definition 'Advanced' section, select 'Support Path MTU discovery'. Make this setting on both sides of the site-to-site tunnel.
If there is a switch between the two Astaros, you may need to lower the MTU of the interfaces - try 1400 just to see if there's a difference.