continuous firewall hits to port 62827 ??

continuous firewall hits to port 62827 ??

Post by c.s. » Mon, 24 Jun 2002 07:31:47



Hi,

I'm running the "Firestarter" firewall on Mandrake 8.2.  and once
Firestarter is running I get hits on port 62827 EVERY SECOND!

the following message also fills up dmesg :

IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:03:47:d6:f5:e0:08:00
SRC=24.50.40.88 DST=255.255.255.255 LEN=72 TOS=0x00 PREC=0x00
TTL=128 ID=24666 PROTO=UDP SPT=1026 DPT=62827 LEN=52

Does anybody know what this means?

Help,
--chris

 
 
 

continuous firewall hits to port 62827 ??

Post by Jack S. La » Mon, 24 Jun 2002 07:43:57


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

c.s.h. did go forth and write:

Quote:> Hi,

> I'm running the "Firestarter" firewall on Mandrake 8.2.  and once
> Firestarter is running I get hits on port 62827 EVERY SECOND!

> the following message also fills up dmesg :

> IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:03:47:d6:f5:e0:08:00
> SRC=24.50.40.88 DST=255.255.255.255 LEN=72 TOS=0x00 PREC=0x00
> TTL=128 ID=24666 PROTO=UDP SPT=1026 DPT=62827 LEN=52

> Does anybody know what this means?

> Help,
> --chris

I can't remember what it means, but in rc.local I have:
iptables -t nat -A PREROUTING -i eth0 -d 255.255.255.255 -j DROP
to stop messages like that one:)
- --
Jack S. Lai - Senior Systems Analyst
http://www.datagraphinc.com
remove -kapu- from email - public key avail above
(Running Slackware 8.1)
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1. Continuous hits on Masq'ing firewall with AT&T @Home

I strongly suspect that this problem is caused by my setup and not a
human attacker, however this seems to be the closest-to-correct place
to post.

I have my Linux box configured as a masquerading firewall.  There are
two other computers running on an ethernet over eth1; the cable modem
is addressed via eth0.  The problem is, /var/log/messages is filling
with denied packets.  (Sample below.)

These messages do not stop, even if I disconnect the masq server from
the rest of the internal network.  They do stop if I disconnect from
the cable modem.

There are a couple of really odd things about these: none of the IP
addresses coincide with anything I've got.  I am using the 192.168.0.x
net locally, and my external IP is 24.10.137.22 (subnet mask
255.255.254.0, as per AT&T's instructions).  As far as I can tell, none
of these packets should be coming anywhere near my machine.

Anyway, help would be greatly appreciated.

----from /var/log/messages----
Nov 29 20:30:10 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.13.154.46:1561 24.13.159.255:39213 L=140 S=0x00 I=20720
F=0x0000 T=128 (#5)
Nov 29 20:30:10 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.6.224.72:520 24.6.227.255:520 L=72 S=0x00 I=37060 F=0x0000
T=128 (#5)
Nov 29 20:30:10 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.8.17.152:1025 24.8.17.255:138 L=220 S=0x00 I=16033 F=0x0000
T=64 (#5)
Nov 29 20:30:11 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.1.10.193:1024 24.1.15.255:138 L=248 S=0x00 I=46409 F=0x0000
T=128 (#5)
Nov 29 20:30:11 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.8.17.154:138 24.8.17.255:138 L=219 S=0x00 I=41291 F=0x0000
T=128 (#5)
Nov 29 20:30:11 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.8.17.23:138 24.8.17.255:138 L=219 S=0x00 I=6875 F=0x0000
T=32 (#5)
Nov 29 20:30:11 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.1.15.234:1024 24.1.15.255:138 L=239 S=0x00 I=57433 F=0x0000
T=128 (#5)
Nov 29 20:30:11 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.1.12.242:1024 24.1.15.255:138 L=246 S=0x00 I=12239 F=0x0000
T=128 (#5)
Nov 29 20:30:11 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.1.12.148:1025 24.1.15.255:138 L=235 S=0x00 I=48390 F=0x0000
T=128 (#5)
Nov 29 20:30:11 aluminum-metal kernel: Packet log: input DENY eth0
PROTO=17 24.6.228.154:137 24.6.229.255:137 L=96 S=0x00 I=4608 F=0x0000
T=128 (#5)

--
                                Ben Olmstead/BEM

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