Gentoo Archives: gentoo-user

From: Mick <michaelkintzios@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Re: Curious ping problem with no FW
Date: Wed, 23 Jul 2008 21:15:04
Message-Id: 200807232214.56647.michaelkintzios@gmail.com
In Reply to: [gentoo-user] Re: Curious ping problem with no FW by Harry Putnam
1 On Tuesday 22 July 2008, Harry Putnam wrote:
2 > Mick <michaelkintzios@×××××.com> writes:
3
4 > > It may be worth checking your router's firewall rules once more. Is the
5 > > gentoo box connected to the router in the same fashion as the MSWindows
6 > > boxen, or is it in some funny DMZ set up?
7 >
8 > The section involving blocking has nothing whatever set.
9
10 OK, but is NATing configured the same way for both Linux & MS Windows
11 machines?
12
13 > > What do the firewall logs show?
14 >
15 > Since there is nothing outgoing set to log, it says nothing.
16
17 Does your router give you the option to log outgoing packets, or monitor them
18 in real time?
19
20 > Here I see:
21 > sysctl -a|grep 'net.*icmp'
22 >
23 > net.ipv4.icmp_echo_ignore_all = 0
24
25 That's how it should be if you want your Linux box to respond to pings.
26
27 > net.ipv4.icmp_echo_ignore_broadcasts = 1
28 > net.ipv4.icmp_ignore_bogus_error_responses = 1
29 > net.ipv4.icmp_errors_use_inbound_ifaddr = 0
30 > net.ipv4.icmp_ratelimit = 250
31 > net.ipv4.icmp_ratemask = 6168
32
33 Nothing amiss here either.
34
35 Have you tried going back to basics: unplug the MSWindows box from your
36 router and plug your Linux box in the same port to see if you can ping
37 internet addresses.
38
39 Can you ping the IP address of ftp.ucsb.edu; i.e. 128.111.24.43 (although I
40 would expect that if your linux had DSN problems you wouldn't be able to
41 browse from it altogether.
42
43 What does traceroute show and how does this compare with traceroute -T?
44 --
45 Regards,
46 Mick

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