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Re: [opensuse-security] A curious firewall message I don't understand.



i think that something on your computer is going down.

first:
128.9.0.107 = ns1.isi.edu

and it's a root name server of DNS as you can see at http://en.wikipedia.org/wiki/Root_nameserver

; formerly NS1.ISI.EDU
;
.                        3600000      NS    B.ROOT-SERVERS.NET.
B.ROOT-SERVERS.NET.      3600000      A     128.9.0.107

second:
icmp type 3 code 0 = Host Unreachable

third:
as you can see at logs, your ROUTER (SRC=192.168.1.1) is sending a packet to you (DST=192.168.1.12) answering "with" Host Unreachable (PROTO=ICMP TYPE=3 CODE=0) that a packet DNS from YOU (SRC) [SRC=192.168.1.12 DST=128.9.0.107 LEN=62 TOS=0x00 PREC=0x00 TTL=64 ID=61490 DF PROTO=UDP SPT=2529 DPT=53 LEN=42 ] can't reach destination.

my recomendation, verify your set of DNS at /etc/resolv.conf, and if it's right, then something is bad onto your computer.

Chejov Suzdal
www.hacktimes.com
www.qualias.net

Wilson Mattos escribió:
Is the external address of your host "128.9.0.107." If so, there is a
host somewhere on the Internet that has this IP address configured as their DNS server. Probably a typo.

 Wil

 ------------
 Wilson Mattos
 Technology Specialist
 wmattos@xxxxxxxxxx
 949-212-2805

 Novell, Inc.
 Novell BrainShare 2008
 This is Your Open Enterprise
 Register at http://www.novell.com/brainshare
>>> "Carlos E. R." <robin.listas@xxxxxxxxxxxxxx> 01/17/08 10:53 AM >>>


Hi,

My setup is:

                    small
adsl---> router ---lan----> PC
           with             (10.3)
          firewall
         192.168.1.1       192.168.1.12


I see these repeated messages on my 10.3 system:

Jan 15 14:16:52 nimrodel kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:40:f4:2e:b1:21:00:30:da:70:d7:ea:08:00 SRC=192.168.1.1 DST=192.168.1.12 LEN=90 TOS=0x00 PREC=0xC0 TTL=255 ID=39491 PROTO=ICMP TYPE=3 CODE=0 [SRC=192.168.1.12 DST=128.9.0.107 LEN=62 TOS=0x00 PREC=0x00 TTL=64 ID=61490 DF PROTO=UDP SPT=2525 DPT=53 LEN=42 ] Jan 15 14:16:52 nimrodel kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:40:f4:2e:b1:21:00:30:da:70:d7:ea:08:00 SRC=192.168.1.1 DST=192.168.1.12 LEN=90 TOS=0x00 PREC=0xC0 TTL=255 ID=39492 PROTO=ICMP TYPE=3 CODE=0 [SRC=192.168.1.12 DST=128.9.0.107 LEN=62 TOS=0x00 PREC=0x00 TTL=64 ID=61490 DF PROTO=UDP SPT=2528 DPT=53 LEN=42 ] Jan 15 14:16:52 nimrodel kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:40:f4:2e:b1:21:00:30:da:70:d7:ea:08:00 SRC=192.168.1.1 DST=192.168.1.12 LEN=90 TOS=0x00 PREC=0xC0 TTL=255 ID=39493 PROTO=ICMP TYPE=3 CODE=0 [SRC=192.168.1.12 DST=128.9.0.107 LEN=62 TOS=0x00 PREC=0x00 TTL=64 ID=61490 DF PROTO=UDP SPT=2529 DPT=53 LEN=42 ] Jan 15 14:16:55 nimrodel kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:40:f4:2e:b1:21:00:30:da:70:d7:ea:08:00 SRC=192.168.1.1 DST=192.168.1.12 LEN=98 TOS=0x00 PREC=0xC0 TTL=255 ID=39500 PROTO=ICMP TYPE=3 CODE=0 [SRC=192.168.1.12 DST=128.9.0.107 LEN=70 TOS=0x00 PREC=0x00 TTL=64 ID=62240 DF PROTO=UDP SPT=2533 DPT=53 LEN=50 ] Jan 16 11:19:18 nimrodel kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:40:f4:2e:b1:21:00:30:da:70:d7:ea:08:00 SRC=192.168.1.1 DST=192.168.1.12 LEN=88 TOS=0x00 PREC=0xC0 TTL=255 ID=20624 PROTO=ICMP TYPE=3 CODE=0 [SRC=192.168.1.12 DST=128.9.0.107 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=41759 DF PROTO=UDP SPT=2696 DPT=53 LEN=40 ] Jan 16 14:07:48 nimrodel kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:40:f4:2e:b1:21:00:30:da:70:d7:ea:08:00 SRC=192.168.1.1 DST=192.168.1.12 LEN=88 TOS=0x00 PREC=0xC0 TTL=255 ID=1746 PROTO=ICMP TYPE=3 CODE=0 [SRC=192.168.1.12 DST=128.9.0.107 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=44799 DF PROTO=UDP SPT=2737 DPT=53 LEN=40 ] Jan 17 11:11:12 nimrodel kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:40:f4:2e:b1:21:00:30:da:70:d7:ea:08:00 SRC=192.168.1.1 DST=192.168.1.12 LEN=123 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=3073 DPT=162 LEN=103 Jan 17 11:11:33 nimrodel kernel: SFW2-INext-DROP-DEFLT IN=eth0 OUT= MAC=00:40:f4:2e:b1:21:00:30:da:70:d7:ea:08:00 SRC=192.168.1.1 DST=192.168.1.12 LEN=88 TOS=0x00 PREC=0xC0 TTL=255 ID=34107 PROTO=ICMP TYPE=3 CODE=0 [SRC=192.168.1.12 DST=128.9.0.107 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=51874 DF PROTO=UDP SPT=2900 DPT=53 LEN=40 ]


They started on Nov 4 (the day after I installed 10.3), and there is a
total of 112 entries.

My first idea was that my router (192.168.1.1) was doing a DNS query to my
linux machine (192.168.1.12), which is weird as the router uses a remote
dns server as defined by my ISP. The linux machine does have a local dns
server as cache and server.

But then I noticed this part:

PROTO=ICMP TYPE=3 CODE=0 [SRC=192.168.1.12 DST=128.9.0.107....

The dest part in brackets is always the same, and it is a dns server
(ns1.isi.edu).


I don't know how to decipher this... what is it all about?


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