RE: Eth1 and eth0

Hi, Craig:

I tried setting the Gateway to eth0 with no positive result. Eventhough
both are on the same machine the subnet is different.

As far as acting as a router, the /proc/sys/net/ipv4/ip_forward is equal
1

These are the outputs you instructed:

Thanks. Jesus...
-----
route -n

[root@custom1 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
10.100.0.0      0.0.0.0         255.255.0.0     U     0      0        0
eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0
eth0
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0
lo
0.0.0.0         10.100.1.245    0.0.0.0         UG    0      0        0
eth0
[root@custom1 root]#

-----
[root@custom1 root]# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:A0:CC:D9:7D:E0
          inet addr:10.100.1.102  Bcast:10.100.255.255  Mask:255.255.0.0
          inet6 addr: fe80::2a0:ccff:fed9:7de0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:234 errors:1 dropped:0 overruns:0 frame:0
          TX packets:321 errors:523 dropped:0 overruns:0 carrier:1042
          collisions:0 txqueuelen:1000
          RX bytes:23727 (23.1 Kb)  TX bytes:36623 (35.7 Kb)
          Interrupt:9 Base address:0x1400

eth1      Link encap:Ethernet  HWaddr 00:50:04:D8:79:A3
          inet addr:192.168.1.204  Bcast:192.168.1.255
Mask:255.255.255.0
          inet6 addr: fe80::250:4ff:fed8:79a3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4712 errors:0 dropped:0 overruns:1 frame:0
          TX packets:3718 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:648107 (632.9 Kb)  TX bytes:739930 (722.5 Kb)
          Interrupt:11 Base address:0x1800

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:5402 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5402 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2746643 (2.6 Mb)  TX bytes:2746643 (2.6 Mb)

sit0      Link encap:IPv6-in-IPv4
          NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

------
cat /etc/sysconfig/network-scripts/ifcfg-eth0

[# Please read /usr/share/doc/initscripts-*/sysconfig.txt
# for the documentation of these parameters.
IPV6INIT=no
ONBOOT=yes
USERCTL=no
PEERDNS=yes
GATEWAY=10.100.1.245
TYPE=Ethernet
DEVICE=eth0
HWADDR=00:a0:cc:d9:7d:e0
BOOTPROTO=none
NETMASK=255.255.0.0
IPADDR=10.100.1.102

----------
cat /etc/sysconfig/network-scripts/ifcfg-eth1

# Please read /usr/share/doc/initscripts-*/sysconfig.txt
# for the documentation of these parameters.
IPV6INIT=no
ONBOOT=yes
USERCTL=no
PEERDNS=yes
GATEWAY=10.100.1.102
TYPE=Ethernet
DEVICE=eth1
HWADDR=00:50:04:d8:79:a3
BOOTPROTO=none
NETMASK=255.255.255.0
IPADDR=192.168.1.204

-----
cat /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=custom1

-----Original Message-----
From: Craig White [mailto:craigwhite@azapple.com]
Sent: Friday, April 15, 2005 10:55
To: plug-discuss@lists.plug.phoenix.az.us
Subject: Re: Eth1 and eth0


On Fri, 2005-04-15 at 10:34 -0700, Jesus E Zepeda wrote:
> Hello, list:
>
> I am using Fedora Core 2 in my computer, which is setup with two NICs:

> Eth1 NIC is connected to the LAN; and eth0 connected to the Internet.
> Also, eth1 NIC has as a gateway an interface of a router.
>
> Both eth0 and eth1 are active. I can ping from one another interface
> and to any host on either side. The problem I have is that I cannot
> reach the other side of the router.
>
> What can I do to be able to have my computer talk to both sides and
> across the router, when I know that the router will reply on the other

> side if I have eth0 (Internet) removed?
----
seems to me that the gateway device should be eth0.

it would be easier if you gave us the output of...

route -n

ifconfig -a

cat /etc/sysconfig/network-scripts/ifcfg-eth0

cat /etc/sysconfig/network-scripts/ifcfg-eth1

cat /etc/sysconfig/network

also, to act as a router, your probably need to do some things like...
echo "1" > /proc/sys/net/ipv4/ip_forward

suggest that you look at...
http://www.ecst.csuchico.edu/~dranch/LINUX/ipmasq/c-html/stronger-
firewall-examples.html#RC.FIREWALL-2.4.X-STRONGER

Craig

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