[PLUG] Re: iptables and protocol 50 and 51

keith morse kgmorse at mpcu.com
Tue Mar 15 00:16:18 UTC 2005


Larry Brigman wrote:
> On Mon, 14 Mar 2005 14:51:01 -0800 (PST), Roderick A. Anderson
> <raanders at acm.org> wrote:
> 
>>I have with a pretty much stock install of Fedora Core 3 with these lines
>>in the /etc/iptables file.
>>
>>       -A RH-Firewall-1-INPUT -p 50 -j ACCEPT
>>       -A RH-Firewall-1-INPUT -p 51 -j ACCEPT
>>
>>What the heck is a protocol 50 or 51?  I am right about this being
>>protocol.  --dport is the port ... right?
> 
> 
> Yes, that should be a port number.
> My search says that port 50 is remote mail checking protocol and 
> 51 is IMP Logical Address Maintenance (reference below).
> http://www.iana.org/assignments/port-numbers


But this is a protocol definition, not a port definition



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