From mboxrd@z Thu Jan  1 00:00:00 1970
From: Y Makki <bugzilla@sympatico.ca>
Subject: Windows file sharing over different subnets
Date: 27 Mar 2003 14:08:46 -0500
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Hello,

I'm faced with a problem on my network, I'll start by describing the
structure. The router is a redhat box, with 3 network cards:
eth0 goes to the dsl modem, ppp0
eth1 goes to the 192.168.1.0 network which contains a Windows 2000 file
server (192.168.1.3)
eth2 goes to 192.168.2.0 which contains windows clients, mostly Win98

Is it possible to allow clients to see/use the file server? what I have
done so far is add "option netbios-name-servers 192.168.1.3;" to
dhcpd.conf and issue the following on the gateway:

ip route add 224.0.0.0/4 dev eth1
route add -net 255.255.255.255 netmask 255.255.255.255 eth1

tcpdump shows some activity when trying to browse network neighborhood
from the fileserver:

a client (192.168.2.2)
----------------------
02:40:58.548757 arp reply 192.168.2.2 is-at 0:40:5:72:f6:6a
02:40:58.549485 192.168.2.2.microsoft-ds > 192.168.1.3.1214: R [tcp sum
ok] 0:0(0) ack 673608238 win 0 (ttl 128, id 3584, len 40)
02:40:58.549552 192.168.2.2.netbios-ssn > 192.168.1.3.1215: S [tcp sum
ok] 197681:197681(0) ack 673643567 win 8760 <mss 1460,nop,nop,sackOK>
(DF) (ttl 128, id 3840, len 48)

the fileserver (192.168.1.3)
----------------------------
02:41:01.476626 192.168.1.3.1215 > 192.168.2.2.netbios-ssn: S [tcp sum
ok] 673643566:673643566(0) win 16384 <mss 1460,nop,nop,sackOK> (DF) (ttl
128, id 13498, len 48)
02:41:01.476736 192.168.1.3.1214 > 192.168.2.2.microsoft-ds: S [tcp sum
ok] 673608237:673608237(0) win 16384 <mss 1460,nop,nop,sackOK> (DF) (ttl
128, id 13499, len 48)
02:41:02.242490 192.168.1.3.1220 > 192.168.1.1.domain:  [udp sum ok] 49+
A? 192.gateway.localdomain. [|domain] (ttl 128, id 13500, len 69)
02:41:02.243234 192.168.1.3.netbios-ns > 192.168.1.255.netbios-ns:  [udp
sum ok]
>>> NBT UDP PACKET(137): QUERY; REQUEST; BROADCAST
TrnID=0x823B
OpCode=0
NmFlags=0x11
Rcode=0
QueryCount=1
AnswerCount=0
AuthorityCount=0
AddressRecCount=0
QuestionRecords:
Name=192             NameType=0x20 (Server)
QuestionType=0x20
QuestionClass=0x1

This goes on for a while, after which win2k says "192.168.2.2" cannot be
found. Browsing from the client 192.168.2.2 yields no results.

Any ideas/hints greatly appreciated.