How to DNAT the only NetBios broadcast traffic (03:00:00:00:00:01)??

["Bassam A. Al-Khaffaf" <bassam@xxxxxxxxxxxxx>]

Dear All,

   I am implementing a Linux box gateway that lunch my own firewall (I wrote my own iptables rules). The gateway connects two LANs, LAN1: 192.168.1.0/24 and LAN2: 192.168.0.0/24. LAN1 contains a windows 2000 server domain controller IP: 192.168.1.231 and LAN2 contains my clients based on windows xp.

 

In fact I got stuck on how to forward ONLY and ONLY the NETBIOS broadcast traffic (03:00:00:00:00:01) from any machine on LAN2 to the domain controller on LAN1. Take note that the NETBIOS traffic is carried on IEEE 802.3 Ethernet.

 

I wrote the following iptable rule, but here all the traffic will be directed from LAN2 to the domain controller on LAN1

Iptables –t nat –A PREROUTING –I eth1 –j DNAT –to-destination 192.168.1.231

 

So can anybody help me on how can I forward the traffic with destination MAC address 03:00:00:00:00:01 from LAN2 to the domain controller (192.168.1.231) on LAN1?

 

Thanks for your support

 

Regards

Bassam

 

 

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.516 / Virus Database: 313 - Release Date: 9/1/2003