Re: routing help
Hi Rod,
After a bit more playing and a bit more thinking I finally figured it
out..I think....
What it looks like is that the router I am using as the gateway
(203.220.47.153) needed to have its ARP table updated or flushed or
something. I don't have control over it so I can't be sure. What I
now have is a script that runs after boot time that looks like:
/sbin/route add -net 203.220.47.152/30 eth0
/sbin/route add default gw 203.220.47.153
/bin/ping -c1 203.220.238.152
/sbin/ifconfig eth0 203.221.41.12 netmask 255.255.255.224 broadcast
203.221.41.31
/sbin/route add -net 203.220.47.152/30 eth0
/sbin/route add default gw 203.220.47.153
/bin/ping -c1 203.220.238.152
/sbin/ifconfig eth0 203.221.41.13 netmask 255.255.255.224 broadcast
203.221.41.31
/sbin/route add -net 203.220.47.152/30 eth0
/sbin/route add default gw 203.220.47.153
/bin/ping -c1 203.220.238.152
/sbin/ifconfig eth0 203.221.41.11 netmask 255.255.255.224 broadcast
203.221.41.31
/sbin/ifconfig eth0:0 203.221.41.12 netmask 255.255.255.224 broadcast
203.221.41.31
/sbin/ifconfig eth0:1 203.221.41.13 netmask 255.255.255.224 broadcast
203.221.41.31
/sbin/route add -net 203.220.47.152/30 eth0
/sbin/route add default gw 203.220.47.153
/bin/ping -c1 203.220.238.152
it basically cycles through the ip addresses pinging a host on just the
other side of the router so it flushes the ARP cache. Does this sound
correct or am I totally off the track here? Anyway it is all working
now but I guess I'd like to know if what I had to do was correct or
not?
Cheers,
Lauchlin
On 26/01/2004, at 2:31 PM, Rod Rodolico wrote:
Sorry to be vague, but there was a command I remember once when I had
this problem before.
Seems like I had to do a route add in /network/interfaces. Seems like
there is some parameter
to an interface that allows you to execute a command after the
interface is brought up, and I
had to do a route add . . . . to get it to work.
However, I'm doing a similar thing, on my server and the only
difference is that my netmask is
not 255.255.255.255,
mine is 255.255.255.224. The first line in the route output was a host
entry that I don't seem to need after all.
which I think is incorrect on yours. Maybe it is the fact that your
netmask is not correct? Following are the first two entries in my
/etc/network/interfaces, and
it works just fine. If I read your output correctly, your netmask
should be a .224 instead of
the .0 I use (since you only have two IP's).
auto eth0
iface eth0 inet static
address 66.17.131.182
netmask 255.255.255.0
network 66.17.131.0
broadcast 66.17.131.255
gateway 66.17.131.1
auto eth0:0
iface eth0:0 inet static
address 66.17.131.183
netmask 255.255.255.0
auto eth0 eth1
iface eth0 inet static
address 203.221.41.11
netmask 255.255.255.224
network 203.221.41.0
broadcast 203.221.41.31
is what I have.
Of course, I could be 100% wrong, in which case someone here will
correct me.
Rod
Hi,
I have an issue with routing that I just can't figure out.
What I have at the moment is a box set up with an IP and route as
follows (some of the details have
route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref
Use
Iface
203.221.41.11 0.0.0.0 255.255.255.255 UH 0 0
0
eth0
203.220.47.152 0.0.0.0 255.255.255.252 U 0 0
0
eth0
203.221.41.0 0.0.0.0 255.255.255.224 U 0 0
0
eth0
0.0.0.0 203.220.47.153 0.0.0.0 UG 0 0
0
eth0
eth0 Link encap:Ethernet HWaddr 00:05:1C:0B:48:A8
inet addr:203.221.41.11 Bcast:203.221.41.31
Mask:255.255.255.224
As can be seen from above the default route is set up to go to a
gateway on a static route.
What I want to do is add an ip alias to eth0 with an ip address of
203.221.41.12 and have it route out through the same gateway.
If I simply do "ifconfig eth0:1 203.221.41.12 netmask 255.255.255.224
broadcast 203.221.41.3" I can ping the IP address from the machine
that is on the same switch (e.g. from 203.221.41.1) but I can not ping
or trace to the ip aliased interface. I have searched around on google
but can't seem to find what I am doing wrong!
Thanks,
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