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



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
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>>> "Carlos E. R." <robin.listas@xxxxxxxxxxxxxx> 01/17/08 10:53 AM >>>
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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?


- -- 
Cheers,
        Carlos Robinson
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