topic Re: ICMP reply size in 4.1 in General Topics

ICMP reply size in 4.1

mbecker — Thu, 20 Jun 2013 10:52:22 GMT

Is it possible in 4.1 to limit the size of icmp replies or strip any payload in order to discourage tunneling via ICMP ?

Re: ICMP reply size in 4.1

VinceM — Thu, 20 Jun 2013 12:05:32 GMT

Hi,

For me, you can't do that.

If the only thing you need in icmp is ping, ping is an app in palo.

Carefull, allow icmp not allow ping and reverse.

Re: ICMP reply size in 4.1

Chatri — Fri, 21 Jun 2013 00:01:03 GMT

Hi,

You could try using the ping command in the following way to alter the size of the ping packets

PA-500> ping size 65468 source 10.30.6.104 host 4.2.2.2

This does give you the ability to vary the size of the icmp packets.

Although the size has to be between 0-65468.

Regards,

Aditya

Re: ICMP reply size in 4.1

UhMayYeah — Fri, 21 Jun 2013 06:53:24 GMT

How about using Zone Protection ?

Particularly ,ICMP Large Packet(>1024)

Other Than that I second

Re: ICMP reply size in 4.1

mikand — Sun, 23 Jun 2013 19:47:52 GMT

I think it would be great if the PA could have a setting to strip the icmp (echo-request/reply) contents. Today one is forced to do this through proxyfirewall using icmp-proxy.

Does anyone know if there perhaps already exists a RFE to strip ICMP contents when passing through a PA device (or if this even is theoretically possible by the hardware being used)?

Re: ICMP reply size in 4.1

UhMayYeah — Tue, 25 Jun 2013 08:26:05 GMT

I am not aware of any RFE for this feature. & ,Please check with your SE for a better insight.

-Ameya