> Hello pf,
> 
> I've been having some problems with a vpn client I use for work (Nortel Contivity). 
> The problem is: I keep getting the connection dropped due to "invalid cookie". I can 
> sometimes connect (after about 5 tries), but I get booted out immediately.

> 
> If it'll help, here's my pf.conf. 
> 
> EXT_IF = "fxp0"

> EXT_AD1 = "xx.xxx.xxx.1"
> EXT_AD2 = "xx.xxx.xxx.2"
> EXT_AD3 = "xx.xxx.xxx.3"
> 
> nat on $EXT_IF from $LAN to any -> $EXT_IF

For posterity, this didn't have anything to do with Nortel Contivity's broken isakmp 
implementation in this case. It had all to do with the fact that I had 3 aliases on 
the NIC $EXT_IF and I was using the NAT rule: 

nat on $EXT_IF from $LAN to any -> $EXT_IF

instead of:

nat on $EXT_IF from $LAN to any -> $EXT_AD1

Apparently, while using the first rule, my outbound IP was cycling in what seemed a 
round-robin fashion. Changing the former rule to the latter helped in this case, as I 
then had a consistent outbound IP address from my LAN. And I didn't need to add the 
NAT/isakmp rules that were suggested earlier to my pf.conf. (My outbound rules are lax 
enough to let the traffic pass).

Thanks for the replies to this thread.

Dave

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