Help with alias interfaces

["Erick Sanz" <esanz@minorplanetusa.com>]

	All,

	I have multiple interfaces in a system (eth1, eth1:0, eth1:1 and eth1:2),
and I need to forward things for several ports to them.

	Since IPtables do not understand eth1:1, my rules look something like
this:

# Ftp server
    iptables -t nat -A PREROUTING -p tcp -d $FTP_IPADDR --dport 21 -j
DNAT --to $FTP_SERVER
    iptables -A FORWARD -i eth1 -p tcp -d $FTP_SERVER --dport 21 -m
state --state NEW -j ACCEPT

# Web server
    iptables -t nat -A PREROUTING -p tcp -d $WEB_IPADDR --dport 80 -j
DNAT --to $WEB_SERVER
    iptables -A FORWARD -i eth1 -p tcp -d $WEB_SERVER --dport 80 -m
state --state NEW -j ACCEPT

	eth1 is my WAN interface... Is this correct?

	Also, for the life of my I don't seem to be able to get DNS resulution to
my
DNS server; my rules are as follows:

    iptables -t nat -A PREROUTING -p udp -d $DNS_1 --dport 53 -j DNAT --to
$DNS_SERVER1
    iptables -t nat -A PREROUTING -p tcp -d $DNS_1 --dport 53 -j DNAT --to
$DNS_SERVER1

    iptables -t nat -A PREROUTING -p udp -d $DNS_2 --dport 53 -j DNAT --to
$DNS_SERVER2
    iptables -t nat -A PREROUTING -p tcp -d $DNS_2 --dport 53 -j DNAT --to
$DNS_SERVER2

    iptables -A FORWARD -i eth1 -p udp -d $DNS_SERVER1 --dport 53 -m
state --state NEW -j ACCEPT
    iptables -A FORWARD -i eth1 -p tcp -d $DNS_SERVER1 --dport 53 -m
state --state NEW -j ACCEPT

    iptables -A FORWARD -i eth1 -p udp -d $DNS_SERVER2 --dport 53 -m
state --state NEW -j ACCEPT
    iptables -A FORWARD -i eth1 -p tcp -d $DNS_SERVER2 --dport 53 -m
state --state NEW -j ACCEPT

	Besides those rules, I also allow ping to those interfaces.

	Does anybody host their own DNS, if so, could you share your rules (without
IP addresses, to protect the identity of the inocent...)    ;)

	Beforehand, thank you for your help!

Best regards,
Erick Sanz



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