Hi all,
I'm new to the list. I've searched everywhere I could think of for a
solution to this, so if it's a FAQ I'll be surprised.
Just by way of introduction, I've been using Linux machines since Slakware
1.0 in '94. I was president of an ISP in a former life, a hardware geek
(PCs to IBM mainframes), and now scratch out a living as a network
engineer/admin. I usually have a pretty good idea what I'm doing.
I'm trying to implement an IP-IP tunnel to connect two groups of machines
in two buildings. They need to talk to each other but not to the rest of
the LAN, since they use a LOT of broadcast packets to chat with each
other. I think the programmers converted it from NetBEUI and missed all
the blinking lights or something. The app sucks badly, but we're stuck
with it by royal decree.
I have two Linux boxen built (RedHat 5.2, kernel 2.0.36). IP tunnelling
works fine between the two nets - EXCEPT for the one thing we need, which
is for UDP packets sent to 255.255.255.255 to appear on both sides of the
tunnel. Here's a somewhat simplified diagram of the setup:
LAN1 LAN2
==============| 10.42.2.131 10.75.78.221 |==============
10.42.250.0/24|--GW1-------------//-------------GW2--|10.75.250.0/24
==============| |==============
Hosts on LAN1 and LAN2 can communicate. Broadcasts on either LAN stay on
that side of the tunnel. I need broadcasts sent to 255.255.255.255 from
LAN1 to show up on LAN2 and vice versa. Yes, I've tried using host routes
for 255.255.255.255, but no luck. Presently the routing table for GW1
looks like this (GW2 looks similar but mirrored, of course):
Destination Gateway Genmask Flags Metric Use Iface
255.255.255.255 10.75.78.221 255.255.255.255 UGH 0 0 tunl0
10.42.2.0 * 255.255.255.0 U 0 0 eth0
10.42.250.0 * 255.255.255.0 U 0 0 eth1
10.75.250.0 10.75.78.221 255.255.255.0 UG 0 0 tunl0
127.0.0.0 * 255.0.0.0 U 0 0 lo
default 10.42.2.31 0.0.0.0 UG 0 0 eth0
I'm about to start losing hair over this, as the boss grows short of
patience. Any suggestions? What am I missing? TIA for suggestions
and/or condolences.
Dale
---
"A computer lets you make more mistakes faster than any invention
in human history - with the possible exceptions of handguns and tequila."
-Mitch Ratliffe, Technology Review April, 1992
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