One Nic 4 IPs

[Guest Jose]

Hi,

I will soon have 5 IP addresses. But I only have one NIC on the computer which will use 4 of the ips. The Linux box will serve as a web server, ftp and maybe dns. Is is possible to point 4 ip addresses to one nic?

[aru]

Sure you can, search for "virtual hosts".

 

I don't know how to set them for an external interface, you'll probably need to hack a bit with your iptables.

 

Basically, the proccess should be similar to the way is done in a LAN. You have to add aliases to your network interface; ie, in my LAN I've set up 9 virtual hosts for my eth0 interface:

/etc# cat /etc/sysconfig/network-scripts/ifcfg-eth0:0

IPADDR="192.168.0.10-19"

/etc#

So that range of IPs (192.168.0.10-19) are assigned to my eth0 NIC.

 

Then on each machine of my lan I assign each IP to each virtual name.domain.ext; I do this by editing /etc/hosts (I don't use dhcp)

 

Also you have to set the virtual hosts address/name if the server application requires it; ie, apache:

/etc# cat /etc/httpd/conf/vhosts/Vhosts.conf

[...]

<VirtualHost 192.168.0.11>

       DocumentRoot /home/httpd/public_html/

       ServerName www.somename.org

       ServerAdmin aru@somename.org

       ErrorDocument 400 /error.php

       ErrorDocument 401 /error.php

       ErrorDocument 403 /error.php

       ErrorDocument 404 /error.php

       ErrorDocument 500 /error.php

</VirtualHost>

[...]