Re: [LARTC] routing query

[Lawrence MacIntyre <lpz@ornl.gov>]

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Payal:

What subnet are your users' machines on?  Is there a third ethernet
address on the linux machine where the user machines connect or are they
connected to one of the two given ethernet interfaces (eth0 or eth1)?  

On Thu, 2003-09-04 at 22:33, Payal Rathod wrote:
> Hi,
> I have a simple question. I asked a friend about it but he was also not
> clear. So, I thought of mailing the list.
> 
> I have a linux box (RH 7.2) which will have 2 net cards. I have 2 types
> of connections to that box. One RF at eth0 and 1 ISDN at eth1.
> Now I told 10 people from the company to give eth1 as their default
> gateway and the rest as eth0. Ok, so far? Now my understanding that with
> the routing table below, all traffic coming to eth0 will be routed thru'
> RF router and all traffic coming to eth1 will be routed through ISDN
> router. Am I right? S, if ISDN fails only 10 people will suffer but the
> rest can continue using RF line. Same case with RF line, if it fails the
> 10 people can use ISDN without any glitch. This is no load balancing
> network. Just a simple routing decision.
> 
> I have,
> route add default gw <ISDN router ip> dev eth1
> route add default gw <RF router ip> dev eth0
> 
> 
> Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
> 127.0.0.0       *               255.0.0.0       U     0      0        0 lo
> 125.0.0.0       *               255.0.0.0       U     0      0        0 eth1
> 125.0.0.0       *               255.0.0.0       U     0      0        0 eth1
> default         203.124.123.111 0.0.0.0         UG    0      0        0 eth0
> default         125.125.125.3   0.0.0.0         UG    0      0        0 eth1
> default         *               0.0.0.0         U     0      0        0 eth0
> 
> Can anyone comment whether I am right in my analysis?
> 
> My friend's comments are given below,
> 
> | I still say that should be necessary. I believe you need to echo 0
> | at some files found by /proc/sys/net/ipv4/conf/*/send_redirects.
> | Otherwise devices won't route through your box, they'll be
> | redirected straight to one of the routers (at random, as far as I
> | know).
> 
> With warm regards,
> -Payal

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