Re: allowing incoming icmp
- From: "Jim Harrison" <jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Fri, 11 Jan 2002 20:13:18 -0800
ICMP doesn't have a "port"; it's a whole different layer in the TCP/IP stack.
You may be referring to a "keepalive ping", where a switch / router will
occasionally make a TCP connection on a given port to verify application state.
This is fairly common in load-balancing hardware..
Is your SMTP server a secureNAT client?
Do you have the correct protocol rules in place?
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/authors/harrison/
Read the books!
----- Original Message -----
From: Greg Mulholland
To: [ISAserver.org Discussion List]
Sent: Thursday, January 10, 2002 16:44
Subject: [isalist] allowing incoming icmp
http://www.ISAserver.org
Im new to isa
How do I make a rule that lets my firewall accept icmp packets from an
address on port 25 (just one address).
I am doing this because my mail will not send and I have had experience with
it before with an old firewall and it fixed the problem. However
I am not sure how or where to do this in isa. Help would be appreciated
Duke
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