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RE: Trace and Ping with Record Option on Cisco Routers

  • From: Danny.Andaluz
  • Date: Tue Dec 23 09:30:10 2003

Title: RE: Trace and Ping with Record Option on Cisco Routers

That's exactly it, Crist.  I did a little research and that the PIX drops any packets with IP Options turned on.  Currently there is no workaround.  This is IP Option 7 to be exact.


-----Original Message-----
From: Crist Clark [mailto:[email protected]]
Sent: Monday, December 22, 2003 6:18 PM
To: Andaluz, Danilo, Triaton/NA
Cc: [email protected]
Subject: Re: Trace and Ping with Record Option on Cisco Routers

> [email protected] wrote:
> Hey, Group.
> In my production network, I'm trying to do some extended traces and
> pings with the record option turned on to see what route my packets
> take going and returning.  It's not working.  If I do the extended
> traceroute or ping without the record option, it works fine.  There is
> a firewall (PIX) a few hops in front of the destination I'm trying to
> record the route for.  What part of ICMP is this that needs to be
> opened on the firewall to allow this to come back?  First time I'm
> coming across this.

It's not ICMP. It's the IP Options. Most firewalls will drop any packet with an IP Options. Many firewalls will not let you turn this off. I do not know how to allow IP Options through a PIX, but I know how to do it in Cisco IOS.

Crist J. Clark                               [email protected]
Globalstar Communications                                (408) 933-4387