RE: Spoof Attack
- From: "Rami SIK" <rami@xxxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Mon, 9 Jun 2003 09:16:03 +0300
Hi Tom,
I further investigated the case, and realized that the spoofing packet is of
type ICMP 3. Then, I closed the inbound ICMP traffic on the Firewall located
before the ISA. I have not seen such alerts since then.
Thanks,
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Rami SIK
System & Network Administrator
CCNA
Kimyatas
Istanbul / Turkey
Tel:90-212-334 4963
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-----Original Message-----
From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
Sent: Monday, June 09, 2003 4:29 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Spoof Attack
http://www.ISAserver.org
Hi Rami,
That explains the spoof. The address it was trying to contact was on the LAT
and LAT networks can never be connected to except through the ISA Server.
HTH,
Tom
Thomas W Shinder
www.isaserver.org/shinder
ISA Server and Beyond: http://tinyurl.com/1jq1
Configuring ISA Server: http://tinyurl.com/1llp
-----Original Message-----
From: Rami SIK [mailto:rami@xxxxxxxxxxxxxxx]
Sent: Friday, June 06, 2003 1:50 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Spoof Attack
http://www.ISAserver.org
This is the following message I got:
ISA Server detected a spoof attack from Internet Protocol (IP) address
10.246.236.1. A spoof attack occurs when an IP address that is not reachable
via the interface on which the packet was received. If logging for dropped
packets is set, you can view details in the packet filter log.
My LAT table contains 10.0.0.0 - 10.255.255.255
My configuration is;
| 10.x.x.x | | 192.168.2.x |
LAN |---------------------| ISA |---------------------------| Firewall
| | | |
--------------------------------------------------------------------
Rami SIK
System & Network Administrator
CCNA
Kimyatas
Istanbul / Turkey
Tel:90-212-334 4963
--------------------------------------------------------------------
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