Re: Please Gurus here solve my simple nw problem

From: news.t-online.de (gyry_at_gmx.de)
Date: 09/10/03 

Date: Wed, 10 Sep 2003 08:45:27 +0200

----- Original Message -----
From: "Llanzlan Klazmon The 15th" <Llanzlan@Llurdiaxorb.net>
Newsgroups: comp.os.linux.networking
Sent: Wednesday, September 10, 2003 12:30 AM
Subject: Re: Please Gurus here solve my simple nw problem

> "news.t-online.de" <gyry@gmx.de> wrote in
> news:bjl52s$3dm$00$1@news.t-online.com:
>
> > Hi,
> > "I am finally stuck up " type of post. I will first explain how my
> > network is built and the problems I am having. I earnestly request the
> > altruists here to help me out.
> >
> > Physical network
> > ********************
> >
> >
> > USERLAN<-----> HUB <--->(eth0)GENTOO ROUTER(eth1)<--Crossover
> > cable----->(eth0)AnotherGentoo
> >
> > So that was about the physical connections of my network.
> >
> > Now..the software part of networking. I decided to keep USERLAN and
> > connected eth0 of router in 192.168.0.0 network. So simply speaking
> > all computer connected directly to HUB are having 192.168.0.x network
> > address. Coming to other side of router, I have decided a simple
> > 192.168.1.0 network, so eth1 of router and Gentoo system have
> > 192.168.1.1 and 192.168.1.2 addresses respectively.
> >
> > I would like to list the commands I used here to setup up this routing
> > table:
> > AT ROUTER:
> > 1. route add 192.168.0.0 eth0
> > 2. route add 192.168.1.0 eth1
>
> You shouldn't need to do this. Both of those subnets are already known to
> the router by virtue of being directly connected networks. I.e they are
> specified by the address and subnet masks you set up on the router eth0 &
> eth1.
Ya, right! everything here is set by default.

>
> >
> > AT Another Gentoo:
> >
> > 1. route add default gw 192.168.1.1
> > 2. route add 192.168.0.0 gw 192.168.1.1
>
> The second line is superfluous.
I was thinking the same.

>
> >
> > With this simple setup, I am able to ping router's eth0 and eth1 from
> > Gentoo system. but I am not able to ping USERS from Gentoo system! I
> > did set ip forwarding to 1.
>
> The hosts on USERLAN have to have 192.168.0.1 as their default gw.
I forgot! I did this and the effect is seen in the routng tables i pasted
below.
>
>
> >
> > Also on the router if I " ping -I eth0 192.168.1.1" it fails. Also
> > "ping -I eth1 192.168.0.1" too fails.. So I think if i make the
> > routing between the 2 eth in router, I can make whole network
> > conected. Am I correct?
>
> Are you allowing packet forwarding, netfilter?
I have enabled packet forwarding in my system to 1. But I have not even
installed netfilter! Is this a kernle module or somethin or an application?
Why actually i need netfilter? Firewall?

>
>
> >I hope my explanation about my problem was
> > clear. If you need any more info, I am here waiting to pump in more
> > detail. Here r my network routes:
> >
> > ROUTE TABLE AT AnotherGentoo (192.168.1.2 eth0)
> > Kernel IP routing table
> > Destination Gateway Genmask Flags Metric Ref Use Iface
> > 0.0.0.0 192.168.1.1 255.255.255.0 UG 0 0 0 eth0
> > 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> > 192.168.0.0 192.168.1.1 255.255.255.0 UG 0 0 0 eth0
> >
> > ROUTE TABLE at Router(eth0-192.168.0.111 eth1-192.168.1.1)
> > erver root # route -n
> > Kernel IP routing table
> > Destination Gateway Genmask Flags Metric Ref Use Iface
> > 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
> > 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> > 127.0.0.0 127.0.0.1 255.0.0.0 UG 0 0 0 lo
> > 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
> >
> > here 192.168.0.1 is in USERS LAN ..presently I am having DSL
> > connection here.
> >
> > The problem is , from 192.168.1.2 I am able to ping 192.168.1.1,
> > 192.168.0.111..BUT I am not able to ping 192.168.0.1!!!! Strange! I am
> > not able to debug this stuff.. PLease help me out at this cliff!
>
> This is odd. Are you sure you are not blocking certain things in
> netfilter?
I am sure, I dont have any netfilter or somthing. ping -I eth0 192.168.1.1
(ping to other interface of the router also fails!!!!!) What the heck?

>
>
> >
> > If anybody can hepl me out! "karamba!" wud be gr8.
> > Thanx,
> > Giri

Thanx again. Plese help me out.
With regards,
Giri

> >
> >
>

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