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Old 02-10-2003, 02:09 AM   #1
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How do I find my IP address?

I get this from ifconfig, which is just the LAN address. How do I get my IP address?

Link encap:Ethernet HWaddr 00:50:BA:A8:EB:A3
inet addr: Bcast:

I use Man 9.0. I connect to the internet through a LAN card to an ADSL modem.
Old 02-10-2003, 03:10 AM   #2
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Old 02-10-2003, 04:57 AM   #3
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I think he wants to know his public ip, which isn't That's just a standard ip config for LANs. Like mine is, but I'm connected through a router as well. I don't know how to find out your public ip with any command or utility in linux, however, this site will display your public ip:
Old 02-10-2003, 05:11 AM   #4
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Old 02-10-2003, 03:19 PM   #5
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Try this one......
Old 02-10-2003, 07:20 PM   #6
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Thanks guys!

Allright, I'm thoroughly confused about firewalls and iptables, now. I read a couple of howto's and understand the chains and commands of iptables, but the bash stuff confuses me. How do firewalls determine your IP if your using DHCP? I'm having a hell of a time trying to get firestarter to work, and I'm wondering if this is the reason why I keep getting 'iptables invalid mask specified' errors.

Does the firewall need my actual public IP address or to just set my LAN address?
Old 02-10-2003, 08:47 PM   #7
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First off a caveat - I don't really know beans about the specifics of Linux routers and iptables. I use Freesco ( on a separate box and I'm primarily a Wintel guy. But...

Assuming that you have only one NIC in the box and it's connected to the ADSL modem, then the modem is running NAT (Network Address Translation) which means the Linux box has no idea what the public IP address is, nor does it care. (This also would mean that for anything to reach you Linux box from the Internet, the modem would also need Port Forwarding, in addition to NAT.)

The following is assuming that this is the only box that is using the ADSL modem - If you're running a LAN, things would be a bit different. If you do need to configure a static address on the Linux box for the firewall to work, you should be able to use any address from to with a 24bit Subnet Mask ( and point to the modem (probably as the Default Gateway. It won't matter that the modem is still running DHCP if there are no other machines connected to it.

Hope this helps a little...


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