I'm using ShrewSoft VPN-client to connect to a client's network. It's an IKEv1 IPsec with AE256, SHA256, and MODP2048. This connection works fine with ShrewSoft VPN-client under Windows7 or Windows10. But if I try to use same settings with ShrewSoft VPN-client under Linux (Xubuntu or Debian), the tunnel is enabled, but there is no traffic coming thru. My tap-device gets a correct IP, but there is no connection to the network. On the linux machines there isn't any "magic", no firewall or whatever - just "regularly" installed machines.
I also tried setting
as in this CentOS forum post, but with no luck.
Any ideas about this?