Re: MSN and Yahoo Block through IPTABLES

Jamie Pratt <jamie@xxxxxxxxx> · Thu, 26 Jun 2003 12:12:47 -0400

Doesn't blocking tcp port 5050 outbound pretty much kill yahoo instant 
messenger clients? (Last I checked, it wouldn't connect for me at home 
until i opened 5050, but then again, maybe they got smarter like msn?)

jamie

Asim Ejaz Butt wrote:
I have tried DROP policy as well but not succeeded.

One thing that I should mentioned that my Internet setup is upload through
normal DDP and download through Satellite Downlink and both are on separate
systems. That is one linux based PC where I am running IPTABLES used to
upload request and the 2nd PC which is a Satellite Receiver used for
download. So my upload request goes to one system and download request
received from another system.

Is that help U to find out that particular problem of blocking MSN/Yahoo
chat using IPTABLES.

Regards,
Asim
----- Original Message -----
From: "David Busby" <busby@xxxxxxxx>
To: "Asim Ejaz Butt" <asim.butt@xxxxxxxxxxxxxxxxxxxxxx>;
<netfilter@xxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, June 25, 2003 11:49 PM
Subject: Re: MSN and Yahoo Block through IPTABLES

Can you set policy to DROP then only allow what you need?

/B

----- Original Message -----
From: "Asim Ejaz Butt" <asim.butt@xxxxxxxxxxxxxxxxxxxxxx>
To: <netfilter@xxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, June 25, 2003 03:23
Subject: MSN and Yahoo Block through IPTABLES

Hello Gurus,

I am trying to block MSN and Yahoo Instant Messengers with my LAN using
IPTABLES. Following commands are used to block them but unsuccessful.

/sbin/iptables -A FORWARD -p tcp -s 192.168.5.85 --dport 1863 -j REJECT
/sbin/iptables -A FORWARD -p tcp -s 192.168.5.85 -d 64.4.0.0/18 -j

REJECT

/sbin/iptables -A FORWARD -d cs.yahoo.com -j REJECT
/sbin/iptables -A FORWARD -d scsa.yahoo.com -j REJECT

Anyone help in blocking them through IPTABLES.

Asim Ejaz Butt
asim.butt@xxxxxxxxxxxxxxxxxxxxxx