Gentoo Archives: gentoo-user

From: Hiren Dave <hiren2k4@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] another iptables question...
Date: Thu, 30 Mar 2006 14:27:47
Message-Id: a944a7520603300622x1fa2e933u75e5afad9d0176c0@mail.gmail.com
In Reply to: Re: [gentoo-user] another iptables question... by Hans-Werner Hilse
1 Hi,
2
3 > please post the output of "iptables -vnL". We're talking about users on
4 that PC, not those using it as a gateway/router/bridge/whatever, correct?
5
6 YES
7
8 Output of iptables -nvL is:
9
10 #iptables -nvL
11 Chain INPUT (policy ACCEPT 24 packets, 1440 bytes)
12 pkts bytes target prot opt in out source
13 destination
14
15 Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
16 pkts bytes target prot opt in out source
17 destination
18
19 Chain OUTPUT (policy ACCEPT 15 packets, 900 bytes)
20 pkts bytes target prot opt in out source
21 destination
22 0 0 ACCEPT all -- * * 0.0.0.0/0
23 0.0.0.0/0 OWNER UID match 0
24 9 540 DROP all -- * * 0.0.0.0/0
25 0.0.0.0/0
26 TnR
27 Hiren
28
29 On 3/28/06, Hans-Werner Hilse <hilse@×××.de> wrote:
30 >
31 > Hi,
32 >
33 > On Tue, 28 Mar 2006 19:44:07 +0530 "Hiren Dave" <hiren2k4@×××××.com>
34 > wrote:
35 >
36 > > I did this:
37 > > [...]
38 > > #iptables -A OUTPUT -m owner --uid-owner 0 -j ACCEPT
39 > > #iptables -A OUTPUT -j DROP
40 > > [...]
41 > > Still other users including root can ping other PCs. Why is this not
42 > > working?
43 >
44 > please post the output of "iptables -vnL". We're talking about users on
45 > that PC, not those using it as a gateway/router/bridge/whatever,
46 > correct?
47 >
48 > > Also I have some diffulties understanding Connection Tracking(NEW,
49 > > ESTABLISHED, RELATED, INVALID) concept.
50 >
51 > Those are protocol dependant. I really think that those are well
52 > described even in iptables man page. Basically, you'll want sth like
53 > this:
54 > iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
55 > and maybe the same for FORWARD. Of course, for FORWARD, you'll want to
56 > match NEW,ESTABLISHED,RELATED for outgoing connections (well, or even
57 > don't impose any restrictions for outgoing connections).
58 >
59 > > Any practical guide available on internet for iptables???
60 >
61 > Lots. That "practical" depends on the problem faced which you didn't
62 > describe at all. So del.icio.us would be my first hint, Google follows:
63 >
64 > http://del.icio.us/tag/netfilter
65 > http://www.google.com/search?q=netfilter
66 >
67 > (note that the concept is usually referred to as "netfilter")
68 >
69 > -hwh
70 > --
71 > gentoo-user@g.o mailing list
72 >
73 >