* myrules comment
@ 2005-02-03 4:58 varun_saa
2005-02-03 6:18 ` Mohammad Khan
2005-02-03 14:18 ` Jason Opperisano
0 siblings, 2 replies; 4+ messages in thread
From: varun_saa @ 2005-02-03 4:58 UTC (permalink / raw)
To: netfilter
Hello,
My server is Mandrake 10.1
eth0 is WAN with static IP connected to 512k DSL
eth1 is LAN.
Basically I want clients to able to :
1. send and recieve mails
2. browse the net through squid
3. Use MSN or Yahoo
My iptables config is as follows :
# Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
*nat
:OUTPUT ACCEPT [0:0]
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING -o eth0 -j MASQUERADE
COMMIT
# Completed on Thu Oct 21 05:32:36 2004
# Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
*mangle
:PREROUTING ACCEPT [32056:3889577]
:INPUT ACCEPT [32010:3885659]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [31637:4617585]
:POSTROUTING ACCEPT [31639:4618071]
COMMIT
# Completed on Thu Oct 21 05:32:36 2004
# Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
*filter
:FORWARD DROP [0:0]
:INPUT DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -j ACCEPT
-A INPUT -s 127.0.0.1 -j ACCEPT
-A INPUT -p tcp -m tcp -i eth1 --dport 3128 -j ACCEPT
-A INPUT -p udp -m udp -i eth1 --dport 3128 --sport 80 -j ACCEPT
-A INPUT -s 62.0.0.0/255.0.0.0 -i eth0 -j REJECT
-A INPUT -p tcp -m tcp -s 217.81.0.0/255.255.0.0 -i eth0 -j REJECT
-A INPUT -i eth0 -j DROP
-A INPUT -p tcp -m tcp -i eth1 --sport 80 -j DROP
-A INPUT -m state -i eth1 --state ESTABLISHED,RELATED -j ACCEPT
-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
-A FORWARD -i eth1 -o eth0 -p tcp --syn --sport 1024 --dport 25 -j ACCEPT
-A FORWARD -i eth1 -o eth0 -p tcp --syn --sport 1024 --dport 110 -j ACCEPT
COMMIT
# Completed on Thu Oct 21 05:32:36 2004
Please feel free to comment and correct.
Thanks
Varun
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: myrules comment
2005-02-03 4:58 myrules comment varun_saa
@ 2005-02-03 6:18 ` Mohammad Khan
2005-02-03 14:18 ` Jason Opperisano
1 sibling, 0 replies; 4+ messages in thread
From: Mohammad Khan @ 2005-02-03 6:18 UTC (permalink / raw)
To: varun_saa, netfilter
On Thu, 2005-02-03 at 09:58 +0500, varun_saa@vsnl.net wrote:
> Hello,
> My server is Mandrake 10.1
> eth0 is WAN with static IP connected to 512k DSL
> eth1 is LAN.
>
> Basically I want clients to able to :
>
> 1. send and recieve mails
>
> 2. browse the net through squid
>
> 3. Use MSN or Yahoo
>
>
> My iptables config is as follows :
>
> # Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
> *nat
> :OUTPUT ACCEPT [0:0]
> :PREROUTING ACCEPT [0:0]
> :POSTROUTING ACCEPT [0:0]
> -A POSTROUTING -o eth0 -j MASQUERADE
> COMMIT
> # Completed on Thu Oct 21 05:32:36 2004
> # Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
> *mangle
> :PREROUTING ACCEPT [32056:3889577]
> :INPUT ACCEPT [32010:3885659]
> :FORWARD ACCEPT [0:0]
> :OUTPUT ACCEPT [31637:4617585]
> :POSTROUTING ACCEPT [31639:4618071]
> COMMIT
> # Completed on Thu Oct 21 05:32:36 2004
> # Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
> *filter
> :FORWARD DROP [0:0]
good
> :INPUT DROP [0:0]
good
> :OUTPUT ACCEPT [0:0]
> -A INPUT -j ACCEPT
You are accepting every packet
> -A INPUT -s 127.0.0.1 -j ACCEPT
rule unreachable
> -A INPUT -p tcp -m tcp -i eth1 --dport 3128 -j ACCEPT
rule unreachable
> -A INPUT -p udp -m udp -i eth1 --dport 3128 --sport 80 -j ACCEPT
> -A INPUT -s 62.0.0.0/255.0.0.0 -i eth0 -j REJECT
> -A INPUT -p tcp -m tcp -s 217.81.0.0/255.255.0.0 -i eth0 -j REJECT
> -A INPUT -i eth0 -j DROP
> -A INPUT -p tcp -m tcp -i eth1 --sport 80 -j DROP
> -A INPUT -m state -i eth1 --state ESTABLISHED,RELATED -j ACCEPT
all rule unreachable
> -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
> -A FORWARD -i eth1 -o eth0 -p tcp --syn --sport 1024 --dport 25 -j ACCEPT
> -A FORWARD -i eth1 -o eth0 -p tcp --syn --sport 1024 --dport 110 -j ACCEPT
> COMMIT
You should IPTables-HowTo.
MOhammad
> # Completed on Thu Oct 21 05:32:36 2004
>
> Please feel free to comment and correct.
>
>
> Thanks
>
> Varun
>
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: myrules comment
2005-02-03 4:58 myrules comment varun_saa
2005-02-03 6:18 ` Mohammad Khan
@ 2005-02-03 14:18 ` Jason Opperisano
1 sibling, 0 replies; 4+ messages in thread
From: Jason Opperisano @ 2005-02-03 14:18 UTC (permalink / raw)
To: netfilter
On Wed, 2005-02-02 at 23:58, varun_saa@vsnl.net wrote:
> Hello,
> My server is Mandrake 10.1
> eth0 is WAN with static IP connected to 512k DSL
> eth1 is LAN.
>
> Basically I want clients to able to :
>
> 1. send and recieve mails
internal users sending mail:
iptables -A FORWARD -i eth1 -o eth0 -p tcp --syn \
--sport 1024: --dport 25 -j ACCEPT
internal users receiving mail via pop3:
iptables -A FORWARD -i eth1 -o eth0 -p tcp --syn \
--sport 1024: --dport 110 -j ACCEPT
> 2. browse the net through squid
internal users connecting to squid:
iptables -A INPUT -i eth1 -p tcp --syn \
--sport 1024: --dport 3128 -j ACCEPT
squid proxy fetching content from the internet:
iptables -A OUTPUT -p udp \
--sport 1024: --dport 53 -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp --syn \
-m owner --uid-owner squid \
--sport 1024: --dport 80 -j ACCEPT
> 3. Use MSN or Yahoo
msn:
iptables -A FORWARD -i eth1 -o eth0 -p tcp --syn \
--sport 1024: --dport 1863 -j ACCEPT
yahoo:
iptables -A FORWARD -i eth1 -o eth0 -p tcp --syn \
--sport 1024: --dport 5050 -j ACCEPT
> My iptables config is as follows :
>
> # Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
> *nat
> :OUTPUT ACCEPT [0:0]
> :PREROUTING ACCEPT [0:0]
> :POSTROUTING ACCEPT [0:0]
> -A POSTROUTING -o eth0 -j MASQUERADE
> COMMIT
> # Completed on Thu Oct 21 05:32:36 2004
> # Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
> *mangle
> :PREROUTING ACCEPT [32056:3889577]
> :INPUT ACCEPT [32010:3885659]
> :FORWARD ACCEPT [0:0]
> :OUTPUT ACCEPT [31637:4617585]
> :POSTROUTING ACCEPT [31639:4618071]
> COMMIT
> # Completed on Thu Oct 21 05:32:36 2004
> # Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
> *filter
> :FORWARD DROP [0:0]
> :INPUT DROP [0:0]
> :OUTPUT ACCEPT [0:0]
> -A INPUT -j ACCEPT
every INPUT rule after this is ignored, as you have just accepted all
packets,
> -A INPUT -s 127.0.0.1 -j ACCEPT
> -A INPUT -p tcp -m tcp -i eth1 --dport 3128 -j ACCEPT
> -A INPUT -p udp -m udp -i eth1 --dport 3128 --sport 80 -j ACCEPT
> -A INPUT -s 62.0.0.0/255.0.0.0 -i eth0 -j REJECT
> -A INPUT -p tcp -m tcp -s 217.81.0.0/255.255.0.0 -i eth0 -j REJECT
> -A INPUT -i eth0 -j DROP
> -A INPUT -p tcp -m tcp -i eth1 --sport 80 -j DROP
> -A INPUT -m state -i eth1 --state ESTABLISHED,RELATED -j ACCEPT
> -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
excellent.
> -A FORWARD -i eth1 -o eth0 -p tcp --syn --sport 1024 --dport 25 -j ACCEPT
> -A FORWARD -i eth1 -o eth0 -p tcp --syn --sport 1024 --dport 110 -j ACCEPT
those rules will only match packets that have a source port of exactly
1024--which won't be many packets. i think you mean "1024:"
-j
--
"Let us all bask in television's warm glowing warming glow."
--The Simpsons
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: myrules comment
@ 2005-02-06 3:42 varun_saa
0 siblings, 0 replies; 4+ messages in thread
From: varun_saa @ 2005-02-06 3:42 UTC (permalink / raw)
To: Jason Opperisano; +Cc: netfilter
----- Original Message -----
From: Jason Opperisano <opie@817west.com>
Date: Thursday, February 3, 2005 7:48 pm
Subject: Re: myrules comment
> On Wed, 2005-02-02 at 23:58, varun_saa@vsnl.net wrote:
> > Hello,
> > My server is Mandrake 10.1
> > eth0 is WAN with static IP connected to 512k DSL
> > eth1 is LAN.
> >
> > Basically I want clients to able to :
> >
> > 1. send and recieve mails
>
> internal users sending mail:
>
> iptables -A FORWARD -i eth1 -o eth0 -p tcp --syn \
> --sport 1024: --dport 25 -j ACCEPT
>
> internal users receiving mail via pop3:
>
> iptables -A FORWARD -i eth1 -o eth0 -p tcp --syn \
> --sport 1024: --dport 110 -j ACCEPT
>
> > 2. browse the net through squid
>
> internal users connecting to squid:
>
> iptables -A INPUT -i eth1 -p tcp --syn \
> --sport 1024: --dport 3128 -j ACCEPT
>
> squid proxy fetching content from the internet:
>
> iptables -A OUTPUT -p udp \
> --sport 1024: --dport 53 -j ACCEPT
>
> iptables -A OUTPUT -o eth0 -p tcp --syn \
> -m owner --uid-owner squid \
> --sport 1024: --dport 80 -j ACCEPT
>
> > 3. Use MSN or Yahoo
>
> msn:
>
> iptables -A FORWARD -i eth1 -o eth0 -p tcp --syn \
> --sport 1024: --dport 1863 -j ACCEPT
>
> yahoo:
>
> iptables -A FORWARD -i eth1 -o eth0 -p tcp --syn \
> --sport 1024: --dport 5050 -j ACCEPT
>
> > My iptables config is as follows :
> >
> > # Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
> > *nat
> > :OUTPUT ACCEPT [0:0]
> > :PREROUTING ACCEPT [0:0]
> > :POSTROUTING ACCEPT [0:0]
> > -A POSTROUTING -o eth0 -j MASQUERADE
> > COMMIT
> > # Completed on Thu Oct 21 05:32:36 2004
> > # Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
> > *mangle
> > :PREROUTING ACCEPT [32056:3889577]
> > :INPUT ACCEPT [32010:3885659]
> > :FORWARD ACCEPT [0:0]
> > :OUTPUT ACCEPT [31637:4617585]
> > :POSTROUTING ACCEPT [31639:4618071]
> > COMMIT
> > # Completed on Thu Oct 21 05:32:36 2004
> > # Generated by iptables-save v1.2.9 on Thu Oct 21 05:32:36 2004
> > *filter
> > :FORWARD DROP [0:0]
> > :INPUT DROP [0:0]
> > :OUTPUT ACCEPT [0:0]
> > -A INPUT -j ACCEPT
>
> every INPUT rule after this is ignored, as you have just accepted all
> packets,
>
> > -A INPUT -s 127.0.0.1 -j ACCEPT
> > -A INPUT -p tcp -m tcp -i eth1 --dport 3128 -j ACCEPT
> > -A INPUT -p udp -m udp -i eth1 --dport 3128 --sport 80 -j ACCEPT
> > -A INPUT -s 62.0.0.0/255.0.0.0 -i eth0 -j REJECT
> > -A INPUT -p tcp -m tcp -s 217.81.0.0/255.255.0.0 -i eth0 -j REJECT
> > -A INPUT -i eth0 -j DROP
> > -A INPUT -p tcp -m tcp -i eth1 --sport 80 -j DROP
> > -A INPUT -m state -i eth1 --state ESTABLISHED,RELATED -j ACCEPT
> > -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
>
> excellent.
>
> > -A FORWARD -i eth1 -o eth0 -p tcp --syn --sport 1024 --dport 25 -
> j ACCEPT
> > -A FORWARD -i eth1 -o eth0 -p tcp --syn --sport 1024 --dport 110 -
> j ACCEPT
>
> those rules will only match packets that have a source port of exactly
> 1024--which won't be many packets. i think you mean "1024:"
>
> -j
>
>Yes that was a typo error.
Thanks a lot for your inputs.
I trying to understand.
Varun
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-02-06 3:42 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2005-02-03 4:58 myrules comment varun_saa
2005-02-03 6:18 ` Mohammad Khan
2005-02-03 14:18 ` Jason Opperisano
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2005-02-06 3:42 varun_saa
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