Firewall-1

[FW-1] Vedr.: [FW-1] how to snoop

Subject: [FW-1] Vedr.: [FW-1] how to snoop
From: Lars Schmidt-Petersen <lsp AT SJA DOT DK>
To: FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM
Date: Fri, 21 Nov 2003 14:38:10 +0100
"Rule:                           0 - Implied Rules"

You have to have a rull, that alows the firewall to send out the vpn 
packets.

Ei - Allow outgoing packets from your firewall before last rull. - An 
option in "global Properties" i smart Dashboard.

Og make an. rull explicit for the connection.
____________________________________________________

Med venlig hilsen  /  Best regards
Lars Schmidt-Petersen                              Tlf. : +45 74 33 53 42
Sønderjyllands Amt - edb-kontoret        e-mail : LSP AT SJA DOT DK
Skelbækvej 2
6200 Aabenraa
____________________________________________________





"Schroeer, Waldemar" <Waldemar.Schroeer AT DE.TTIINC DOT COM>
Sendt af: Mailing list for discussion of Firewall-1 
<FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM>
21-11-2003 14:09
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        Til:    FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM
        cc:     (bcc: Lars Schmidt-Petersen/EDB/SjA)
        Vedr.:  [FW-1] how to snoop


Hi,

i am currently trying to set up vpn between my checkpoint ng+ai, running 
on
sparc solaris, and a cisco pix. it does not work at first go. so tried to
use snoop to see whether there are any IKE related packets originated on 
my
site or coming from the vpn endpoint. i tried the following (just assume
10.10.105.2 is the external nic of the fw):
 snoop -r -V from 10.10.105.2 or to 10.10.105.2

i did a telnet from outsite and snoop showed me this incoming packet
correctly even if the rulebase is blocking such packets. when i try to 
make
any connection from a host on my site to a host on the other site of the 
vpn
tunnel, nothing happens. snoop remains mute and after a while, about a
minute sometime a little bit more, i get the following error:
--------------------------------------------------------
Number:                         1091517
Date:                           20Nov2003
Time:                           17:43:31
Product:                        VPN-1 & FireWall-1
Interface:                      daemon
Origin:                         eukey003 (10.10.105.2)
Protocol:                       ip
Action:                         Reject
Type:                           Log
Reject Reason:                  IKE failure
Rule:                           0 - Implied Rules
Encryption Scheme:              IKE
VPN Peer Gateway:               TX__VPN-Gateway (120.50.162.6)
Information:                    encryption failure: no response from peer.
--------------------------------------------------------

twenty seconds later i get:

--------------------------------------------------------
Number:                         1091523
Date:                           20Nov2003
Time:                           17:43:55
Product:                        VPN-1 & FireWall-1
Interface:                      hme1
Origin:                         eukey003 (10.1.102.31)
Source:                         eukey003 (10.10.105.2)
Destination:                    TX__VPN-Gateway (120.50.162.6)
Protocol:                       udp
Service:                        IKE (500)
Action:                         Drop
Type:                           Log
Rule:                           0 - Implied Rules
Source Port:                    IKE (500)
Destination Key ID:             0x00000000
Encryption Scheme:              IKE
VPN Peer Gateway:               TX__VPN-Gateway (120.50.162.6)
Encryption Methods:             ESP: AES-128 + MD5
Community:                      TX_EU_VPN_2
Information:                    encryption fail reason: Packet is dropped
because there is no valid SA - please refer to solution sk19423 in
SecureKnowledge Database for more information
--------------------------------------------------------

thanks,
waldemar

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