Mailinglist Archive: opensuse-security (409 mails)

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AW: [suse-security] Need help with IPSEC
  • From: "Wolfgang Schulz (Home)" <w.schulz@xxxxxx>
  • Date: Sun, 11 Aug 2002 22:54:45 +0200
  • Message-id: <MGEIJGEDDLBBCBJELKIIKEBFCBAA.w.schulz@xxxxxx>


> -----Ursprüngliche Nachricht-----
> Von: Steffen Dettmer [mailto:steffen@xxxxxxx]
> > I'm using SuSE 7.0 (with FreeS/WAN 1.4) on a firewall gateway
> > and SafeNet/Softremote for a WIN2000 machine and want to
> > configure a road warrior VPN. The road warriod should connect
> > to a maskeraded net (10.96.1.64/26) behind the firewall. The
> > problem which makes me cracy is the following: I can establish
> > an SA - there is a tunnel between the WIN2000 machine and the
> > firewall. I can ping from the road warrior PC to the internal
> > address of the firewall (10.96.1.102) but I can't ping or make
> > a connection to any other machine in that subnet.
>
> May it be a "ordinary" routing problem? From the firewall / VPN
> GW, you can ping -I 10.96.1.102 10.96.1.65 (or whatever
> destination)?

I can only ping the internal interface of the firewall (10.96.1.102) but no
other address of this subnet. But also with 10.96.1.102 there is something
not correct because I can't establish a tcp connection e.g. to port 22
(where sshd is listening).

> > I tested with tcpdump that the ICMP packets arrive at the ipsec
> > interfac on the firewall but nothing is sent out at the
> > internal interface (eth0).
>
> Do you use rp filters? Do you have ip forward enabled? Strange...
> You tried it without firewalling at all, correct?

I tried it without firewall rules. IP forward is enabled.


> > For me this looks like a routing problem but I have no idea
> > what could be configured in another way.
>
> Is this configured on the same VPN GW / external box? Is the
> setup the same but without a road warrior?

It is my intention to configure the other VPN connection on the same box but
it is not done at the moment. I only wanted to emphasize with this statement
that the firewall rules should be ok. Also there are no rejected packets in
the log.

Without established connection I have:
fw:~ # netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
213.30.70.232 0.0.0.0 255.255.255.248 U 0 0 0
eth1
213.30.70.232 0.0.0.0 255.255.255.248 U 0 0 0
ipsec0
10.96.1.64 0.0.0.0 255.255.255.192 U 0 0 0
eth0
10.96.1.128 10.96.1.106 255.255.255.192 UG 0 0 0
eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 213.30.70.233 0.0.0.0 UG 0 0 0
eth1

With established connection I get (I hope I have the first line correctly in
my mind because I can't currently establisg a connection becasue I'm at
home):
fw:~ # netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
xxx.xxx.xxx.xxx 213.30.70.233 255.255.255.0 U 0 0 0
ipsec0
213.30.70.232 0.0.0.0 255.255.255.248 U 0 0 0
eth1
213.30.70.232 0.0.0.0 255.255.255.248 U 0 0 0
ipsec0
10.96.1.64 0.0.0.0 255.255.255.192 U 0 0 0
eth0
10.96.1.128 10.96.1.106 255.255.255.192 UG 0 0 0
eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 213.30.70.233 0.0.0.0 UG 0 0 0
eth1

I searched in a lot of archives today and found a lot of questions where the
problems sound similar to me, but I found no solution or answer to the
problem.

As I stated in my first email: If I start a ping from an internal machine
(e.g. 10.96.1.116) I see with tcpdump at the ipsec0 interface that there is
an ICMP packet sent out and there is also an answer arriving. But this
answer is not forwarded to the internal interface (eth0).

I really don't know anymore what to do!

Wolfgang









> oki,
>
> Steffen
>
> --
> Dieses Schreiben wurde maschinell erstellt,
> es trägt daher weder Unterschrift noch Siegel.
>
> --
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>


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