nixCraft

Hello
I am a new user to Linux but in the last couple of months gained some Idea about it,

I am trying to set up a small network in my office having 3 windows xp PCs, two fedora10 PCs

I have an adsl router with 4-port hub connecting to the internet,

one switch (say sw1) and one linux PC (say linux1) is connected directly to the router, the three win xp PCs are connected to switch sw1.

all the above is working fine, I am able to get connected to Internet In all the systems, and able to network among all the above four.

Now I want to make the linux1 as a proxy server for, hence I added another network card into it connected it to another switch sw2, which is connected to another linux pc (say linux2).

I have tried a hundred things, and googled an equal no. and finally posting it here.

In order to reduce confusion I have disabled DHCP in all machines, and given static ips instead
NetworkManager was not happy about it, hence to fix my static IP i disabled NetworkManager ('chkconfig NetworkManager off')

|---winxp3
|---winxp2
|---winxp1
|
sw1
|
router--(eth0)linux1(eth1)--sw2--(eth0)linux2
|
internet


the above is a schematic of my network, sw1 and sw2 are 8 port-switches

all is well except there is no visibility between the two linux systems linux1 and linux2,

This is the /etc/sysconfig/network-scripts/ifcfg-eth0, of linux1

DEVICE=eth0
BOOTPROTO=static
BROADCAST=192.168.1.255
HWADDR=00:e0:27:21:01:17
IPADDR=192.168.1.3
NETMASK=255.255.255.0
NETWORK=192.168.1.0
ONBOOT=yes
GATEWAY=192.168.1.1
TYPE=Ethernet
NM_CONTROLLED=no
USERCTL=no
PEERDNS=yes
MII_NOT_SUPPORTED=yes
DNS1=192.168.1.1 # where i found in /etc/resolv.conf


this is the -------/etc/sysconfig/network-scripts/ifcfg-eth1, of linux1-------

DEVICE=eth1
BOOTPROTO=static
ONBOOT=yes
HWADDR=00:1f:d0:32:29:a7
IPADDR=192.168.2.3 # here I want make different class of network
NETMASK=255.255.255.0
TYPE=Ethernet
USERCTL=no
PEERDNS=no
NETWORK=192.168.2.0
BROADCAST=192.168.2.255
GATEWAY=192.168.1.3 ---# this linux1 static IP

------------this is the "ifconfig" of linux1--------------

eth0---- Link encap:Ethernet HWaddr 00:E0:27:21:01:17
inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::2e0:27ff:fe21:117/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8021 errors:0 dropped:0 overruns:0 frame:0
TX packets:9165 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4855236 (4.6 MiB) TX bytes:1716932 (1.6 MiB)
Interrupt:16 Memory:fa000000-fa0000ff

eth1 Link encap:Ethernet HWaddr 00:1F0:32:29:A7
inet addr:192.168.2.3 Bcast:192.168.2.255 Mask:255.255.255.0

--------------- do------------------

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:95 errors:0 dropped:0 overruns:0 frame:0
TX packets:95 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:18290 (17.8 KiB) TX bytes:18290 (17.8 KiB)

--------- this is interface from linux1 ---------

auto lo
iface lo inet loopback
address 127.0.0.1
netmask 255.255.255.0

auto eth0
iface eth0 inet static
address 192.168.1.3
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.1

auto eth1
iface eth1 inet static
address 192.168.2.3
netmask 255.255.255.0
broadcast 192.168.2.255

----------this is iptables -L from linux1--------
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

the above all is from Linux1 now i would like to connect to LAN usins DHCP for assigning IP's.

then trying with Linux2, i am not able to connect to the LAN, even i am not able to find any IP from DHCP....
if I say in command line " ifconfig"

eth0 Link encap:Ethernet HWaddr 00:1F0:42:0D:90
inet6 addr: fe80::21f:d0ff:fe42:d90/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1 errors:2 dropped:0 overruns:0 frame:2
TX packets:22 errors:1 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:60 (60.0 b) TX bytes:4696 (4.5 KiB)
Interrupt:20 Base address:0xe000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:800 (800.0 b) TX bytes:800 (800.0 b)

------------------ Here i am not getting IP....................................


please help me and let me know where am i doing wrong...????

I would be very happy you could solve my problem.....

Best regards

Slims.

The traffic between eth0 and eth1 will be routed only if you enable IP forwarding and use iptables to setup Linux as a router. You do not need two Linux PCs. A single computer with two network card can act as proxy and router.

|xp1
|xp2
|xp3
|
Lan switch
|
|
eth0
------
Linux Box
------
eth1 ---> Internet

Your Linux box can act as firewall, proxy and NAT device. It will protect LAN from the Internet problems and attacks.
How to setup Linux as a router for DSL, T1 line etc

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