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* RE: RE: INPUT and PORTS
@ 2006-11-02  3:23 anisha.chandrasekaran
  0 siblings, 0 replies; 3+ messages in thread
From: anisha.chandrasekaran @ 2006-11-02  3:23 UTC (permalink / raw)
  To: devnull, bimal_pandit; +Cc: netfilter


I dunno much on this but I could jus help with what I know.

If the 30 ports involve consecutive numbers you could specify it as a
range, say, 10-30.

However if the all the ports are scattered and varied numbers then you
can create a user defined chain which accepts all the port numbers (use
multiport option.Then specify this chain as target when you add a rule
in FORWARD chain. Thereafter you need to specify that list of ports just
once in the user defined chain.

I think this may be helpful but I am not sure if this will suffice your
requirement.


 Regards,

Anisha Chandrasekaran

 
        

-----Original Message-----
From: plugthebox.net /dev/null [mailto:devnull@plugthebox.net]
Sent: Wednesday, November 01, 2006 8:57 PM
To: bimal pandit
Cc: netfilter@lists.netfilter.org; Anisha Chandrasekaran (WT01 -
Broadband Networks)
Subject: Re: RE: INPUT and PORTS

I want to thank you all for contributing.

I'm currently setting up a firewall and a web interface for it. My
strategy is to have:

/sbin/iptables -P INPUT -j DROP
/sbin/iptables -P FORWARD -j DROP
/sbin/iptables -A FORWARD -d 10.2.2.115 -j ACCEPT
/sbin/iptables -A FORWARD -s 10.2.2.115 -j ACCEPT
/sbin/iptables -A INPUT -s 10.2.2.115 -j ACCEPT
/sbin/iptables -A FORWARD -d 10.2.2.116 -j ACCEPT
/sbin/iptables -A FORWARD -s 10.2.2.116 -j ACCEPT
/sbin/iptables -A INPUT -s 10.2.2.116 -j ACCEPT
/sbin/iptables -A FORWARD -d 10.2.2.117 -j ACCEPT
/sbin/iptables -A FORWARD -s 10.2.2.117 -j ACCEPT
/sbin/iptables -A INPUT -s 10.2.2.117 -j ACCEPT
etc...
/sbin/iptables -A INPUT -j DROP
/sbin/iptables -A FORWARD -j DROP

Meaning, i want to accept the connections from these 3 IPs, and drop all
the rest. Now i want to let those allowed IPs to only use 3 ports for
the INPUT and more than 30 ports for FORWARDs (p2p and misc ports).

I can't use -m multiport for each FORWARD, there are too many ports that
1 FORWARD line can run.

I thought by allowing the ports BEFORE the IPs, that it would accept
allow only the ports ACCEPTed to the IPs ACCEPTed, is that correct?

thanks,
Sincerely,

On Wed, 2006-11-01 at 14:57 +0000, bimal pandit wrote:
> Dear All,
>
>
> On Wed, 01 Nov 2006 anisha.chandrasekaran@wipro.com wrote :
> >
> >I would like to have a little more clear idea on what you need to do
> >exactly????
> >
> >That is, DO you need to allow only 80 and 20 ports from the specified
> >ip?
> >In that case you can have
> >Iptables -P FORWARD DROP
> >Iptables -A FORWARD -p tcp -s 10.2.2.115 -m multiport --dports 80,22
> -j
> >ACCEPT
> >
> >The above rule will allow only 80 and 22 requests from that ip. Is
> this
> >clear or am I not answering what you are asking????
> >
> >
> >  Regards,
> >
> >Anisha Chandrasekaran
> >
> >
> >
> >-----Original Message-----
> > From: netfilter-bounces@lists.netfilter.org
> >[mailto:netfilter-bounces@lists.netfilter.org] On Behalf Of
> >plugthebox.net /dev/null
> >Sent: Wednesday, November 01, 2006 6:19 PM
> >To: netfilter
> >Subject: INPUT and PORTS
> >
> >Hello,
> >I want to do the following, accept in comings from 10.2.2.115 only
> >restricting to port 80,22
> >
> >is this correct?
> >
> >-P rules ...
> >-F rules ...
> >/sbin/iptables -A FORWARD -d 10.2.2.115 -j ACCEPT
> >/sbin/iptables -A FORWARD -s 10.2.2.115 -j ACCEPT
> >/sbin/iptables -A INPUT -s 10.2.2.115 -j ACCEPT
> >/sbin/iptables -A FORWARD -m multiport -p tcp --ports 80,22 -j ACCEPT
> >/sbin/iptables -A INPUT -m multiport -p tcp --ports 80,22 -j ACCEPT
> >
> >Eventhough i saw this setup in many tutorials/howtos,  when ever i
> want
> >to block 10.2.2.115 (by not listing him in the INPUT -j ACCEPT), that
> ip
> >can still connect to port 80 and 22.
> >
> >
> >
> >Thanks
> >Sincerely,
> >
> >
> in my view, since you have already accepted all the connections from
> 10.2.2.115, so there is no question of blocking it as iptables work on
> "FIRST MATCH FOUND".
>
> regards,
>
> Bimal Pandit
>
>
>
>



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2006-11-01 15:26 ` RE: INPUT and PORTS plugthebox.net /dev/null
2006-11-01 17:40   ` Wakko Warner
2006-11-02  3:23 anisha.chandrasekaran

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