pc with laptop: network but no internet [SOLVED]

PARENA · Guru Joined: 06 Jan 2003 Posts: 349

Here is my situation: I've got a PC which gets it's info from my ISP dhcp-wise. No problems there, I have internet access. It's on eth0, of course. Then, there eth1, which I use to connect my laptop to via crosscable. This all used to work fine, until recently. I figure it was a messed up baselayout etc-update I did.

So, now I've got my eth1 in the pc which has 192.168.0.1 and the laptop eth0 with IP 192.168.0.2. They can talk to each other, no problem. But when I try to ping anything from my laptop, other than the PC, nothing happens. It can't find anything. I tried disableing the firewall, but that wasn't the problem. I bet it's in my iptables, though those haven't changed. Or perhaps I changed them, screwing it up even more... Anyway, this must be a problem people get a lot (couldn't find a solution searching, though). Anybody have an idea?

Oh yeah, some extra information might come in handy.

/etc/conf.d/net on te pc:
<code>iface_eth0="dhcp"
iface_eth1="192.168.0.1 broadcast 192.168.0.255 netmask 255.255.255.0"</code>

/etc/conf.d/net on the laptop:
<code>iface_eth0="192.168.0.2 broadcast=192.168.0.255 netmask 255.255.255.0"
gateway="eth0/192.168.0.1"</code>

GeoffOs · n00b Joined: 13 Dec 2003 Posts: 56 Location: Cheshire

What is your gateway on the laptop?
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NeddySeagoon · Posted: Sat Nov 06, 2004 1:01 pm Post subject:

PARENA,

On the laptop do

80686 · n00b Joined: 07 Jun 2004 Posts: 18 Location: /home/manuel

is /proc/sys/net/ipv4/ip_forward set to 1?
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PARENA · Guru Joined: 06 Jan 2003 Posts: 349

Thanks for all the replies. The problem was the ip_forward was 0. But how does that happen and why do I have to set it to 1 manually. Do I have to do that every time the pc boots?

NeddySeagoon · Posted: Sat Nov 06, 2004 8:26 pm Post subject:

PARENA,

There is an ioctrl for that but I forget what it is.
Add the command to /etc/conf.d/local.start exactly as you type it and it will be run at every boot for you.
I think its also a kernel option but thats a rebuild.
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PARENA · Guru Joined: 06 Jan 2003 Posts: 349

I'll be looking for that kernel option, I don't mind recompiling. Hopefully I can get rid of this problem once and for all.

80686 · n00b Joined: 07 Jun 2004 Posts: 18 Location: /home/manuel

As I know you HAVE to set it manually to 1. The kernel is made to behave like that.

What could be is the you've changed something in /etc/conf.d/iptables.
There you can control if /proc/sys/net/ipv4/ip_forward should be set to 1 when /etc/init.d/iptables will be executed on bootime.
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god is real,
unless he's integer