[Openswan Users] Cisco VPN Concentrator not responding

Luca enz_tn2002 at yahoo.com
Thu Sep 9 16:15:21 CEST 2004

On Wed, 8 Sep 2004, Paul wrote:
> On Wed, 8 Sep 2004, Luca wrote:

> > But the cisco vpn don't responding. Why?

> Perhaps you have using Aggressive mode on the cisco? If
> possible, use MainMode instead of Aggressive mode.
> If aggressive mode is really needed, explicitely enable
> it in ipsec.conf for that connection.

Which parameter I must add to ipsec.conf for try with Aggressive Mode. I 
searched in documentation but nothing.
When the vpn start from cisco I see the first packet on port 500 and this 
packet in header ISAKMP the flags Exchange Type is equal 1 Main Mode from 
I tried also with vpn client cisco on linux this work, in trace I see
a first packet on port 29476/udp from client to cicsco, response from cisco 
concentrator with packet tcp SYN/ACK (without SYN) and another packet from 
client to cisco on port 29476/udp.

200.x.x.x.1036 > 201.x.x.x.29746:  udp 12 (DF)
201.x.x.x.10000 > 200.x.x.x.2345: S 18842116:18842116(0) ack 16796840 win 
200.x.x.x.1036 > 201.x.x.x.29746:  udp 8 (DF)

With the client cisco I see which start in Aggressive Mode. 
The person which manage the cisco tell me which use only MainMode.

Thanks for help

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