[Openswan Users] VPN Client thru Alcatel Modem
Robert W. Burgholzer
rburgholzer at maptech-inc.com
Wed May 19 12:00:09 CEST 2004
What kind of client is behind the Alcatel modem?
At 04:30 PM 5/19/2004 +0200, Leonard Tulipan wrote:
>After a lot of debugging, I am finally stranded.
>We have the followin setup
>10.0.0.1 VPN Client
>Alcatel DSL Router Speedtouch 510
>X.X.X.X Linux VPN Firewall
>192.168.118.* Private Net behind FW
>Ok, nothing interesting.
>Now, when I trace VPN Connections with tcpdump, I see
>client:UDPPort500 -> server:Port500 ISAKMP Phase 1, 2, etc
>So Packets ALWAYS come from Port 500 and go to Port 500
>I also checked the VPN client it also behaves well and has Port 500 as
>But the Alcatel Router (after getting the firewall-config to let the
>corresponding traffic thru) changes all that, so that I get packets
>dslrouter:UDPPort(Random between 19000 and 20000) -> server:Port500
>This does not work!
>Is THIS the one reason I need the NAT-T Patch, or can I somehow get the
>server to accept packages, even though, the src_port isn't correct?
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>Users at lists.openswan.org
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