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Franck BALAZOT
2001-Jul-04 06:27 UTC
How to manage routing with two NIC on the same network

Hi all,

Here is my problem. I need to use a linux box to manage the internet
bandwidth. The problem is that I need to use two public IP address on
the 2 network interface of my linux router :

             +--------------+        +-----------+
+----------------+
Internet ----| Cisco router |--------| linux box |--------| firewall +
NAT |------ LAN (192.168.0.0)
             +--------------+        +-----------+
+----------------+
                                    eth1       eth0
               195.115.96.a    195.115.96.b  195.115.96.c
195.115.96.d

the Cisco router, the linux and the firewall have public IP address on
the same network.

I need some help to configure the routing table of the linux box,
because in this configuration
the packet at destination of 195.115.96.0 are routed on eth0 and also on
eth1 and I can''t delete these routes with the route utility.

What I want is to route all the packet at destination of 195.115.96.d by
eth0 and create a default route by eth1 :

Destination     Gateway         Genmask        Flags Metric Ref    Use
Iface
195.115.96.d       *          255.255.255.240    UGH   0      0     0
eth0
127.0.0.0          *          255.0.0.0          U     0      0     0
lo
default       195.115.96.a    0.0.0.0            UG    0      0     0
eth1

but what I have is (and it doesn''t work) :

Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
195.115.96.d       *          255.255.255.240    UGH   0      0     0
eth0
195.115.96.0       *          255.255.255.240    U     0      0     0
eth0
195.115.96.0       *          255.255.255.240    U     0      0     0
eth1
127.0.0.0          *          255.0.0.0          U     0      0     0
lo
default       195.115.96.a    0.0.0.0            UG    0      0     0
eth1


Thanks for help !

------------------------------------------------
Franck BALAZOT (fbalazot@aeta.fr)
AETA.COM
361, Avenue du Général De Gaulle
92140 CLAMART
FRANCE
Tél:01.41.36.12.93
------------------------------------------------


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Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit

<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<tt>Hi all,</tt><tt></tt>
<p><tt>Here is my problem. I need to use a linux box to manage the
internet
bandwidth. The problem is that I need to use two public IP address on the
2 network interface of my linux router :</tt><tt></tt>
<p><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+--------------+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+-----------+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+----------------+</tt>
<br><tt>Internet ----| Cisco router |--------| linux box |--------|
firewall
+ NAT |------ LAN (192.168.0.0)</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+--------------+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+-----------+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+----------------+</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
eth1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; eth0</tt>
<br><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
195.115.96.a&nbsp;&nbsp;&nbsp; 195.115.96.b&nbsp;
195.115.96.c&nbsp;&nbsp;&nbsp;
195.115.96.d</tt><tt></tt>
<p><tt>the Cisco router, the linux and the firewall have public IP
address
on the same network.</tt><tt></tt>
<p><tt>I need some help to configure the routing table of the linux
box,
because in this configuration</tt>
<br><tt>the packet at destination of 195.115.96.0 are routed on eth0
and
also on eth1 and I can''t delete these routes with the route
utility.</tt><tt></tt>
<p><tt>What I want is to route all the packet at destination of
195.115.96.d
by eth0 and create a default route by eth1 :</tt><tt></tt>
<p><tt>Destination&nbsp;&nbsp;&nbsp;&nbsp;
Gateway&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Genmask&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Flags Metric Ref&nbsp;&nbsp;&nbsp;
Use Iface</tt>
<br><tt>195.115.96.d&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
255.255.255.240&nbsp;&nbsp;&nbsp; UGH&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; eth0</tt>
<br><tt>127.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
255.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
U&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp; lo</tt>
<br><tt>default&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
195.115.96.a&nbsp;&nbsp;&nbsp;
0.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
UG&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp; eth1</tt><tt></tt>
<p><tt>but what I have is (and it doesn''t work)
:</tt><tt></tt>
<p><tt>Destination&nbsp;&nbsp;&nbsp;&nbsp;
Gateway&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Genmask&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Flags Metric Ref&nbsp;&nbsp;&nbsp;
Use Iface</tt>
<br><tt>195.115.96.d&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
255.255.255.240&nbsp;&nbsp;&nbsp; UGH&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; eth0</tt>
<br><tt>195.115.96.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
255.255.255.240&nbsp;&nbsp;&nbsp;
U&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; eth0</tt>
<br><tt>195.115.96.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
255.255.255.240&nbsp;&nbsp;&nbsp;
U&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp; eth1</tt>
<br><tt>127.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
255.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
U&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp; lo</tt>
<br><tt>default&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
195.115.96.a&nbsp;&nbsp;&nbsp;
0.0.0.0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
UG&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;
0&nbsp; eth1</tt>
<br><tt></tt>&nbsp;<tt></tt>
<p><tt>Thanks for help !</tt><tt></tt>
<p><tt>------------------------------------------------</tt>
<br><tt>Franck BALAZOT (fbalazot@aeta.fr)</tt>
<br><tt>AETA.COM</tt>
<br><tt>361, Avenue du G&eacute;n&eacute;ral De
Gaulle</tt>
<br><tt>92140 CLAMART</tt>
<br><tt>FRANCE</tt>
<br><tt>T&eacute;l:01.41.36.12.93</tt>
<br><tt>------------------------------------------------</tt>
<br><tt></tt>&nbsp;</html>

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LARTC - Jul 2001 - How to manage routing with two NIC on the same network

How to manage routing with two NIC on the same network
