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Aix sending out icmp packets?

Why does Aix v5.1 send out icmp packets? Can it be turned off? Should it be turned off?  I have other sys admins contacting me asking me why were pinging them.  And, it's generating alerts in our firewall monitoring logs.
1 Solution
Probably because you have path MTU discovery turned on. To check run:

    no -o tcp_pmtu_discover


    no -o udp_pmtu_discover

If either of these equal 1, then turn them off via these commands:

    no -o tcp_pmtu_discover=0


    no -o udp_pmtu_discover=0
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