[SOLVED] how to utilize multiple ext. ip

adam7979 · 01-10-2010, 11:13 AM

hi guys,

i have 3 external IPs, assigned on eth0, eth0:1 and eth0:2.

I have a game bot that connects to a game network, but the game network only accepts a limit of 5 connection from same ip. The game network has multiple IP addresses. (e.g. game.com resolves to 1.1.1.1, 1.1.1.2, 1.1.1.3 etc)

How do i specify that certain bot connects via eth0:1 and eth0:2? Currently all bots are using eth0's ip.

Thanks for any input.

Regards,
Adam

alunduil · 01-10-2010, 01:54 PM

Is there a place on the client's side that allows you to change the host? If so simply change the host parameter to one of the other IPs. That should do the trick.

Regards,

Alunduil

adam7979 · 01-10-2010, 05:23 PM

Thanks alunduil ... Tried it, didn't work

The initial connecting process is still using eth0 i guess....

I'm thinking of something like "if connect to 1.1.1.1 to 1.1.1.3 use eth0, if connect to 1.1.1.4 to 1.1.1.6 use eth0:1" etc. Is that possible with iptables?

Adam

alunduil · 01-10-2010, 05:28 PM

Should be, but it should be handled automatically by the interfaces' routing table. What's the output of netstat -nrt?

Regards,

Alunduil

adam7979 · 01-10-2010, 06:45 PM

thanks again,

Code:

[root@mymachine ~]# netstat -nrt
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
ext.ip.160.0     0.0.0.0         255.255.240.0   U         0 0          0 eth0
169.254.0.0      0.0.0.0         255.255.0.0     U         0 0          0 eth0
0.0.0.0         ext.ip.160.1     0.0.0.0         UG        0 0          0 eth0
[root@mymachine ~]# ifconfig
eth0      inet addr:ext.ip.161.xxx  Bcast:ext.ip.175.255  Mask:255.255.240.0
eth0:0    inet addr:ext.ip.167.yyy  Bcast:ext.ip.175.255  Mask:255.255.240.0
eth0:1    inet addr:ext.ip.168.zzz  Bcast:ext.ip.175.255  Mask:255.255.240.0

nimnull22 · 01-10-2010, 06:53 PM

Quote:

Originally Posted by adam7979

hi guys,
...
The game network has multiple IP addresses. (e.g. game.com resolves to 1.1.1.1, 1.1.1.2, 1.1.1.3 etc)
...
Adam

What is exact IP of the game server? I would like to know last digits (xxx.xxx.___.___)

Thanks

adam7979 · 01-10-2010, 06:56 PM

it's useast.battle.net

alunduil · 01-10-2010, 06:59 PM

The first problem I see is that you have one interface being used for all outgoing traffic. You need one entry for each interfaces IP and subnet in the routing table unless, are you trying to get a round robin style load balance to happen?

Regards,

Alunduil

adam7979 · 01-10-2010, 07:02 PM

yeah right after you asked me to -nrt i saw my own problem... guess i'll take sometime to google it out. Thanks for the lead Alunduil

edit: tried the route add -host ext.ip dev eth0:0 from http://www.faqs.org/docs/Linux-mini/IP-Alias.html

am i still missing something ?

will google into round-robin style now, if that's possible....

nimnull22 · 01-10-2010, 07:39 PM

I have not ask you, is your game bot on linux ?

adam7979 · 01-10-2010, 07:45 PM

yeah, i compile and run ghost bot (www.codelain.com) on linux, and it comes to a point that i need to get the 9th bot to connect to the same realm (useast.battle.net) with my second external IP address. Limit per realm IP is 8. Hope i made it clear.

nimnull22 · 01-10-2010, 08:09 PM

You can try like this:
Add to iptable rule:

Code:

iptables -t nat -A POSTROUTING -p ALL -j SNAT --to-source 192.168.1.1-192.168.1.5

Change that IP range to real one.

adam7979 · 01-10-2010, 08:30 PM

thanks for the input, nimnull. A quick google on your suggestion returns me this before i actually try it on my own server. Will try it later (because my ip address(es) is not continuous...) and let you know the result while i'll keep googling further

nimnull22 · 01-10-2010, 08:53 PM

In that case, you can also read about "balance":
http://linux.die.net/man/1/balance

adam7979 · 01-11-2010, 12:45 AM

thanks again nimnull and alunduil, i did it the most stupid way but, it's working

Code:

iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.1 --to-source my.ext.ip.1
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.2  --to-source my.ext.ip.1
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.3  --to-source my.ext.ip.1
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.4  --to-source my.ext.ip.1
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.5  --to-source my.ext.ip.2
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.6  --to-source my.ext.ip.2
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.7  --to-source my.ext.ip.2
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.8  --to-source my.ext.ip.2
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.9  --to-source my.ext.ip.3
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.10  --to-source my.ext.ip.3
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.11  --to-source my.ext.ip.3
iptables -t nat -A POSTROUTING -p ALL -j SNAT --dst game.server.ip.12  --to-source my.ext.ip.3