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Network Security Security-Basics
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Re: Removing ping/icmp from a network

Subject: Re: Removing ping/icmp from a network
Date: Tue, 25 Mar 2008 17:17:54 +0000
Secure This wrote:
I have a variety of clients with data centres who all make use of icmp/ping to monitor their servers/appliances/devices (often with poorly configured snmp versions 1 and 2).

Could anybody kindly advise me of tools and strategies for minimising or removing the use of icmp/ping on a supposedly secure network?

Thanks in advance

If you have any switches with layer 3 capabilities, block all icmp traffic in ACLs. For example, from a Cisco 3750:

ip access-list extended foo
 permit icmp any any packet-too-big
 deny   icmp any any
 permit ip any any
!
interface GigabitEthernet1/0/whatever
 switchport access vlan 999
 switchport mode access
 ip access-group foo in
 spanning-tree portfast
 spanning-tree bpduguard enable


Hope this helps!

Jon K.
--
Jon R. Kibler
Chief Technical Officer
Advanced Systems Engineering Technology, Inc.
Charleston, SC  USA
(843) 849-8214





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