Multiple (Redundant) Internet Connection

Multiple (Redundant) Internet Connection

Post by paul.. » Sun, 25 Mar 2001 15:47:03



Hi,

I am not sure whether this question was asked or not.  If it was
asked, could you direct me to where I can find more information?

Our company is looking to setup multiple (redundant) internet
connections for our webservers.  We are consider T1, DSL, and
Wireless.  These services will be from different providers and we just
want to make sure our site can be reached if one of the provider goes
down temporarily.  We are aware of co-host (or co-location), but we
would like to house this ourselves.  What can be done at the linux box
to be serviced by multiple internet providers?  Any info would be much
appreciated.

Thanks in advance
Paul

 
 
 

Multiple (Redundant) Internet Connection

Post by Markku Kolkk » Sun, 25 Mar 2001 18:20:27



> What can be done at the linux box
> to be serviced by multiple internet providers?  Any info would be much
> appreciated.

Connct the sufficient amount of network interfaces, and run dynamic
routing software like GateD or Zebra.

Make sure that the physical connections to different ISPs are really
separate, not just different wire pairs in one cable.

People in comp.os.linux.networking may have better answers.

--
        Markku Kolkka


 
 
 

1. Q about redundant internet feeds, multiple gateways, redhat 7

We have 2 available Internet connections, for redundancy, but we're
having trouble getting the second feed to work.

We have two feeds coming in on one 10baseT cable into a hub, and from
the hub we are connecting to the two network cards.

Our ifconfig setup:

eth0      Link encap:Ethernet  HWaddr 00:00:00:00:00:01  
          inet addr:1.2.3.226  Bcast:1.2.3.231  Mask:255.255.255.248
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1914722 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2100107 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          Interrupt:11 Base address:0xa800

eth2      Link encap:Ethernet  HWaddr 00:00:00:00:00:02  
          inet addr:4.5.6.226  Bcast:4.5.6.231  Mask:255.255.255.248
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9570 errors:0 dropped:0 overruns:0 frame:0
          TX packets:51 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          Interrupt:3 Base address:0xa000

Our routing table:
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref
Use Iface
4.5.6.224  0.0.0.0         255.255.255.248 U     0      0        0
eth2
1.2.3.224  0.0.0.0         255.255.255.248 U     0      0        0
eth0
0.0.0.0         1.2.3.225  0.0.0.0         UG    0      0        0
eth0

The default gateway route for the 4.5.6.224 network is SUPPOSED to be
.225, but when I try to add that route to the routing table after
removing the default to go through 1.2.3.225, I get this:

root /etc> route del -net 4.5.6.224 netmask 255.255.255.248
root /etc> route add -net 4.5.6.224 netmask 255.255.255.248 gw
4.5.6.225 eth2
SIOCADDRT: Network is unreachable
root /etc> _

So, I added the network back on the default gateway for the time
being:

root /etc> route add -net 12.146.197.224 netmask 255.255.255.248 eth2

I'm pretty low on the skill side of setting up redundant links like
this. Can someone provide any pointers on what I can try? I'm above
average in terms of other areas of Linux administration, just never
set up a second network feed like this.

RedHat 7.0, i386, 2.2.16-22

Any assistance or pointers would be greatly appreciated.

Ian Douglas

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