10-09-2006 12:17 PM - edited 03-09-2019 04:27 PM
what is the difference between echo and echo reply in icmp permit any echo inside
and vice versa..
10-09-2006 12:18 PM
One is a request, the other is the reply.
10-09-2006 12:31 PM
so does the request send only a request and reply both request and reply?
10-09-2006 01:01 PM
Hi,
ICMP echo-request is generated by the device from which the PING is originated. ICMP echo-reply is sent by the target device to the requesting device stating that it received the echo-request.
HTH
Sundar
10-09-2006 02:01 PM
my ques here is if yoou have only one either echo request or echo reply what will be the effect as given in command
icmp permit any echo-request inside
or
icmp permit any echo-reply inside
10-09-2006 04:50 PM
a. icmp permit any echo-request inside
- can send ping request to inside interface, but sender will not get reply.
b. icmp permit any echo-reply inside
- can get reply when pinging inside interface
To control ping request directed to your firewall interfaces, allow only specific ICMP type, i.e, allow only trusted IP/host to ping.
Carefully when allow ping to your outside interface from any internet/external host, esp to avoid ping/icmp attack.
http://www.rhyshaden.com/icmp.htm
Cheers!
AK
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