[Openswan Users] Tunnel up, can ping, cannot connect!! :S

"Ing. Rodrigo Méndez" rodrigomf at bl.com.mx
Thu Dec 2 13:36:31 EST 2010

Hi again

You helped me last week in setting up a VPN that went apparently successful, but there's a problem.

I remind you my configuration: xxx.xxx.xxx.1 (my public centos box) <-----> yyy.yyy.yyy.2 (Juniper vpn concentrator) <---> zzz.zzz.zzz.3 (box in private lan)

I can ping the machine in the remote LAN perfectly (xxx.1 to zzz.3) but cannot connect to any port through telnet. The interesting part of this is that I see the ESP traffic coming out of xxx.1, the admin of the Juniper Concentrator (yyy.2) can see my traffic coming through and also the guy in the zzz.3 box (private lan).

But this guy (zzz.3) sees the connection dropping each time. See example:

[admwsph at WebSphere2pt ~]$ while true; do netstat -na | grep 9082; sleep 3; done 
tcp        0      0 zzz.zzz.zzz.3:9082          xxx.xxx.xxx.1:46650       SYN_RECV     
tcp        0      0 :::9082                     :::*                        LISTEN    

This command is run in zzz.3

Do you have any idea of what can be going on here?

Thank you very much for your help.

El 23/11/2010, a las 14:51, Paul Wouters escribió:

> On Tue, 23 Nov 2010, "Ing. Rodrigo Méndez" wrote:
>> This is the result from ipsec verify:
> Looks good.
>> The people from the Juniper VPN concentrator say they don't see any traffic coming from our IPs, so it would seem there's no traffic coming out from Box 1
>> (CentOS box). The strange thing is it doesn't work even if iptables is disabled (so no blocking is apparently occurring, or at least it isn't the main
>> problem).
>> My best guess now is that I'm having a routing problem. 
> I don't think so...
>> Any ideas on how to tell Linux to route the packages going to zzz.zzz.zzz.3 through the tunnel?? (I'm using netkey, not KLIPS)
> manual routing should not be used. netlink will snatch the packets.
>> I can't find any route to yyy.yyy.yyy.2 or zzz.zzz.zzz.3 (the box in the private lan) anywhere in the routing table. I'm not sure if this is OK.
> that's fine.
> It seems you have one interface online. Are you behind a port forward? Is your upstream
> router filtering packets?
> Try adding forceencaps=yes ?
> Paul

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