Hi All:
Can someone give me a sanity check? I am relatively new to Linux
(less then 2 years) and have never setup a VPN before.
We are attempting to establish a VPN to a client's system. The
client has a Cisco PIX Firewall 515 and I have been attempting to
implement Cisco's Linux VPN Client software (V3.5.2) without
much success.
To start with, I doubt that the problem is at the client's end as
the Cisco unit has been in place for a while and they have several
Windows based clients accessing it without any problems. However
they have never implement the Linux VPH client software so they
have been of limited help.
At our end, we have an GNet DSL Modem that is feeding one side of
RH6.2/IPChains based firewall. The other side of the firewall
feeds our internal class C subnet. I have setup the Cisco client
software on a separate RH7.2 system for testing.
Question 1: Is this configuration viable or should have setup the
VPN software on either the firewall or a box with
external access.
Continuing with my story, I am able to ping the Cisco router from
the test system so the overall connectivity would appear to be good
and NAT is working.
I have added the following rules to our firewall script:
ipchains -A input -p 50 -s $ANY -d $ANY -j ACCEPT
ipchains -A input -p 51 -s $ANY -d $ANY -j ACCEPT
ipchains -A input -p tcp -s $ANY -d $ANY 500 -j ACCEPT
ipchains -A input -p udp -s $ANY -d $ANY 500 -j ACCEPT
ipchains -A input -p tcp -s $ANY -d $ANY 10000 -j ACCEPT
ipchains -A input -p udp -s $ANY -d $ANY 10000 -j ACCEPT
ipmasqadm portfw -a -P tcp -L $EXTIP1 500 -R $FISRH1 500
where ANY=0/0, EXTIP1 is the external IP address and FISRH1 is
the IP address of the box that the VPN software is installed.
In desparation I have also added:
ipchains -A input -p tcp -s $ANY 500 -d $ANY -j ACCEPT
ipchains -A input -p udp -s $ANY 500 -d $ANY -j ACCEPT
ipchains -A input -p tcp -s $ANY 10000 -d $ANY -j ACCEPT
ipchains -A input -p udp -s $ANY 10000 -d $ANY -j ACCEPT
Question 2: Anything obiously wrong with the firewall mods?
When I attempt connect the VPN client it failes with the messages:
Cisco Systems VPN Client Version 3.5.2 (Rel)
Copyright (C) 1998-2002 Cisco Systems, Inc. All Rights Reserved.
Client Type(s): Linux
Running on: Linux 2.4.20-24.7 #1 Mon Dec 1 13:21:45 EST 2003 i586
Initializing the IPSec link.
Contacting the gateway at AAA.BBB.CCC.DDD
Remote peer is no longer responding.
The resulting log file contains:
1 13:57:34.353 12/17/2003 Sev=Info/4 CLI/0x43900002
Started vpnclient:
Cisco Systems VPN Client Version 3.5.2 (Rel)
Copyright (C) 1998-2002 Cisco Systems, Inc. All Rights Reserved.
Client Type(s): Linux
Running on: Linux 2.4.20-24.7 #1 Mon Dec 1 13:21:45 EST 2003 i586
2 13:57:34.365 12/17/2003 Sev=Info/4 CVPND/0x4340000F
Started cvpnd:
Cisco Systems VPN Client Version 3.5.2 (Rel)
Copyright (C) 1998-2002 Cisco Systems, Inc. All Rights Reserved.
Client Type(s): Linux
Running on: Linux 2.4.20-24.7 #1 Mon Dec 1 13:21:45 EST 2003 i586
3 13:57:34.366 12/17/2003 Sev=Info/4 IPSEC/0x43700014
Deleted all keys
4 13:57:34.366 12/17/2003 Sev=Info/4 IPSEC/0x43700009
IPSec driver already started
5 13:57:34.366 12/17/2003 Sev=Info/4 IPSEC/0x43700009
IPSec driver already started
6 13:57:34.366 12/17/2003 Sev=Info/4 IPSEC/0x43700014
Deleted all keys
7 13:57:35.369 12/17/2003 Sev=Info/4 CM/0x43100002
Begin connection process
8 13:57:35.371 12/17/2003 Sev=Info/4 CM/0x43100004
Establish secure connection using Ethernet
9 13:57:35.371 12/17/2003 Sev=Info/4 CM/0x43100026
Attempt connection with server "AAA.BBB.CCC.DDD"
10 13:57:35.371 12/17/2003 Sev=Info/6 IKE/0x4300003B
Attempting to establish a connection with AAA.BBB.CCC.DDD.
11 13:57:35.586 12/17/2003 Sev=Info/4 IKE/0x43000013
SENDING >>> ISAKMP OAK AG (SA, KE, NON, ID, VID, VID, VID) to
AAA.BBB.CCC.DDD
12 13:57:35.586 12/17/2003 Sev=Info/4 IPSEC/0x43700009
IPSec driver already started
13 13:57:35.586 12/17/2003 Sev=Info/4 IPSEC/0x43700014
Deleted all keys
14 13:57:40.588 12/17/2003 Sev=Info/4 IKE/0x43000013
SENDING >>> ISAKMP OAK AG (Retransmission) to AAA.BBB.CCC.DDD
15 13:57:45.628 12/17/2003 Sev=Info/4 IKE/0x43000013
SENDING >>> ISAKMP OAK AG (Retransmission) to AAA.BBB.CCC.DDD
16 13:57:50.668 12/17/2003 Sev=Info/4 IKE/0x43000013
SENDING >>> ISAKMP OAK AG (Retransmission) to AAA.BBB.CCC.DDD
17 13:57:55.708 12/17/2003 Sev=Warning/2 IKE/0xC300007C
Exceeded 3 IKE SA negotiation retransmits... peer is not responding
18 13:57:55.708 12/17/2003 Sev=Info/4 CM/0x43100014
Unable to establish Phase 1 SA with server "AAA.BBB.CCC.DDD" because of
"DEL_REASON_PEER_NOT_RESPONDING"
19 13:57:55.708 12/17/2003 Sev=Info/5 CM/0x43100029
Initializing CVPNDrv
20 13:57:56.828 12/17/2003 Sev=Info/4 IPSEC/0x43700009
IPSec driver already started
21 13:57:56.828 12/17/2003 Sev=Info/4 IPSEC/0x43700014
Deleted all keys
I have replaced the client IP address with AAA.BBB.CCC.DDD.
An suggestions would be greatly appreciated.
Regards, Hugh
--
Hugh E Cruickshank, Forward Software, www.forward-software.com
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