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Community Member

Filter ICMP Timestamp requests

I need to filter ICMP Timestamp requests at our outer router. Is it as simple as adding this to our ACL? deny udp/tcp any any eq ports 13 and 14

2 REPLIES
Cisco Employee

Re: Filter ICMP Timestamp requests

No. ICMP is not udp nor tcp. You should use something like this:

access-list 101 deny icmp any any timestamp-request

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Community Member

Re: Filter ICMP Timestamp requests

Thanks! That is going in the ACL today.

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