Hi,
On Tue, 2011-05-17 at 11:13 -0700, Aleksey Tsalolikhin wrote:
> [root@hwdltsaloli ~]# cat /etc/sysconfig/iptables
> # Firewall configuration written by system-config-securitylevel
> # Manual customization of this file is not recommended.
> *filter
> :INPUT ACCEPT [0:0]
> :FORWARD ACCEPT [0:0]
> :OUTPUT ACCEPT [0:0]
> :RH-Firewall-1-INPUT - [0:0]
> -A INPUT -j RH-Firewall-1-INPUT
> -A FORWARD -j RH-Firewall-1-INPUT
> -A RH-Firewall-1-INPUT -i lo -j ACCEPT
> -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
> -A RH-Firewall-1-INPUT -p 50 -j ACCEPT
> -A RH-Firewall-1-INPUT -p 51 -j ACCEPT
> -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
> COMMIT
> [root@hwdltsaloli ~]# lsof -i:50
> [root@hwdltsaloli ~]# lsof -i:51
> [root@hwdltsaloli ~]#
>
>
> /etc/services says:
>
> re-mail-ck 50/tcp # Remote Mail Checking Protocol
> re-mail-ck 50/udp # Remote Mail Checking Protocol
>
> la-maint 51/tcp #
> la-maint 51/udp # IMP Logical Address
> Maintenance
>
> Google turns up RMCP is a simple lightweight DP protocol for checking
> if you have mail on a server
>
> A quick Google search failed to turn up what is "IMP Logical Address
> Maintenance"
The -p you are referring to is NOT a port, but a protocol (number), 50
and 51 stand for IPSEC protocols (AH and ESP).
[michel@deltaflyer ~]$ cat /etc/protocols | grep 51
ah 51 AH # Authentication Header
ipv6-auth 51 IPv6-Auth # Authentication Header for IPv6 (not in
official list)
[michel@deltaflyer ~]$ cat /etc/protocols | grep 50
esp 50 ESP # Encap Security Payload
ipv6-crypt 50 IPv6-Crypt # Encryption Header for IPv6 (not in official
list)
Please read 'man iptables' :)
Regards,
Michel
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