Marko Cupa??(marko.cu...@mimar.rs) on 2014.05.30 11:32:14 +0200:
> Hi,
> 
> let's say for example I have web server on internal network, and I have
> redirected tcp port 80 from firewall to it:
> 
> pass in on $ext_if inet proto tcp from any to $pub_web port 80 \
>    rdr-to $priv_web

>From the wording of your subject, i suspect you somehow think that rdr-to
has something to do with "icmp redirects", icmp messages with type 5.

This is not so.

> Assuming that $pub_web ip address is used exclusively for web server
> access, and no other ports are redirected to other internal addresses,
> should I also redirect icmp:
> 
> pass in on $ext_if inet proto icmp from any to $pub_web rdr-to $priv_web

No.

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