Linux -> XP LAN. doesn't work Internet but ssh yes

nahuelSkpr · 02-14-2008, 12:57 PM

Hello my name is Nahuel, I'm new in the forum.
My quesetion is as follows
I've made a small lan at home with two PC, one with gentoo (2.6.23-r8) and the other with WinXp. The problem I have is that i can connect with ssh from the PC with xp (using a live CD of gentoo) to my PC with the installed gentoo, but the Internet doesn't work.
Here, the datails.
gentoo PC:
eth0 ( 192.168.1.2 ) -> inet
eth1 ( 192.168.2.1 ) -> lan
iptables nat:
iptables -t nat -A POSTROUTNG -s 192.168.2.0/24 -j MASQUERADE
XP PC:
Lan ip ( 192.168.2.2 )

Any ideas of what could be happening ? Any other information you need?

Thanks

theNbomr · 02-14-2008, 03:30 PM

Your ISP should supply a valid IP for the WAN connection (192.168.x.x is only valid as a LAN address). Usually, this will be done with DHCP, so your ethernet config file should specify this. I don't know how Gentoo configures networking, but if it is like Redhat, it should contain something like
( /etc/sysconfig/network-scripts/ifcfg-eth0 )

Code:

ONBOOT=yes
DEVICE=eth0
BOOTPROTO=dhcp
USERCTL=no
IPV6INIT=no
PEERDNS=yes
TYPE=Ethernet

Note the 'BOOTPROTO' line.

Use something like firestarter to configure your Linux host as a firewall/router.

--- rod.

nahuelSkpr · 02-15-2008, 10:39 AM

Well I have a WAN IP from my ISP. I know 192.168.x.x is only valid as LAN address, but shouldn't be my adsl modem doing dchp? Am I wrong ?

theNbomr · 02-15-2008, 12:30 PM

Yes, the DSL modem, or likely something upstream, should be providing DHCP services. However, you said

Quote:

eth0 ( 192.168.1.2 ) -> inet

which does not make sense. If you are saying that the DHCP server assigned the 192.168... address, then I suggest you double check that, because I cannot imagine any ISP's DHCP server assigning that address. What, if anything, have you done to configure the eth0 interface?
--- rod.

jdavis2 · 02-15-2008, 12:45 PM

Can you not get to the Internet from the Gentoo PC or the XP PC?

Also, are you actually using XP while using ssh to connect to the Gentoo PC or are you booting a Gentoo Live CD on the XP PC to ssh to your Gentoo PC?

nahuelSkpr · 02-18-2008, 07:01 AM

Hello budies.
theNbomr, I think I've been miss undertood. What I tried to mean when I say
eth0 ( 192.168.1.2 ) -> inet
I meant that it was the NIC that is going out to the internet, and the other one is the one that is being used to bring up the LAN between the two PCs. Thats why its not necessary dhcp here, because the IPs are assigned by me.
Well, the problem has been solved. Thanks averyone for helping out. Do you want to know what it was ? jejeje Do you remember the FORWARD chain from iptables ? Well it default policy was DROP !!! It seems to be that I changed it once, and I forgot to set the default as ACCEPT. Stupid one...

Thanks a lot