Dear Sir,
I have setup a proxy server for internet access in my
organization which has 2 ethernet interfaces ; one on internal network
(private ip address) while other at external network (public ip address).
I am getting a lot of netbios traffic on my internal ethernet
interface. Below is some log from "tcpdump".
23:07:23.882767 10.8.99.94.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:25.099189 10.8.99.246.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:25.530105 10.8.99.151.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:25.588964 10.8.99.53.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:30.029731 10.8.99.32.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:31.967519 10.8.99.117.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:35.444045 10.8.99.93.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:40.557846 10.8.99.153.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:41.990228 10.8.99.72.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:43.427439 10.8.99.111.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:49.453507 10.8.99.252.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:49.989453 10.8.99.86.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:07:56.425559 10.8.99.95.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:08:00.874673 10.8.99.83.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:08:06.093484 10.8.99.152.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:08:11.742309 10.8.99.115.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
23:09:12.733224 10.8.99.248.netbios-dgm > 10.8.99.255.netbios-dgm: NBT UDP
PACKET(138)
Sir, I want to block this traffic using IPTABLEs. IPTABLES is
installed on my proxy server.
Please help me by telling me how to block this traffic.
I hope a positive reply from your side.
Thank you.
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