> -A RH-Firewall-1-INPUT -p 50 -j ACCEPT
> -A RH-Firewall-1-INPUT -p 51 -j ACCEPT

That's _protocol_ 50 and 51; not ports 50 and 51

% grep '5[01]' /etc/protocols 
esp     50      ESP             # Encap Security Payload
ah      51      AH              # Authentication Header

IPSec traffic.

-- 

rgds
Stephen
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