Gentoo Archives: gentoo-user

From: Tim Igoe <tim@×××××××.uk>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] 161 UDP Constant Connections
Date: Fri, 08 Jul 2005 14:43:36
Message-Id: 42CE8E7B.3050606@igoe.me.uk
In Reply to: [gentoo-user] 161 UDP Constant Connections by Michael Thompson
1 Michael Thompson wrote:
2 > This IP 212.56.68.108 has been attempting to contact Port 161 UDP for
3 > Months.
4
5 Are you running SNMP on your box? Port 161 is SNMP, if you have it open
6 to the outside world, could it be collecting data - hence often connections?
7
8 >
9 > No when I try and run a NMAP scan against the box, I get my own logs filled
10 > with the NMAP Scan. It is like 212.56.68.108 is mirroring to my IP Space.
11 > And I dont Understand why!
12 >
13 > The connecting IP is in my ISP range, however it has no rDNS which the ISP
14 > would do according to their technical support. It maps back to
15 > hugeglobal.net
16
17 Contact your ISPs support department - see if they can help at all?
18
19 >
20 > I'm not entirely sure it is a customer's machine, even though it is within
21 > the ISP IP range. It's rDNS shows it is
22 >
23 > hugeglobal.net.
24 >
25 > The odd thing to me, is if one does a lookup on hugeglobal.net one gets
26 >
27 > 82.103.128.2 and the rDNS of that is
28 >
29 > e82-103-128-2s.easyspeedy.com
30 >
31
32 Possible the original hugeglobal.net machine has since changed ISPs but
33 the old IP has been re-assigned without the rDNS entry being changed?
34
35 > Not one of the local ISP I am using.
36 >
37 > Telnetting to the IP gives this:
38 >
39 > Telnet 212.56.68.108 connects giving...
40 >
41 > _ _ _
42 > ___ | |_ _ __ _ __ ___ __ _ _ ()_ __ ___ __| |
43 > / _ \| __| '_ \ | '__/ _ \/ _` | | | | | '__/ _ \/ _` |
44 > | (_) | |_| |_) | | | | __/ (_| | |_| | | | | __/ (_| |
45 > \___/ \__| .__/ |_| \___|\__, |\__,_|_|_| \___|\__,_|
46 > |_| |_|
47 > If you do not have a CMN registered OTP device you
48 > will not be able to login.
49 >
50 > OTP USERS: THIS CONNECTION IS NOT ENCRYPTED, BE SMART
51 >
52 > larabee login:
53 >
54 >
55 > Any one got any ideas?
56 >
57 >
58 you could just try blackholing the IP at your firewall, or as i've
59 already mentioned - try and contact your ISP with all you know and see
60 if htey can shed any light on it - its possible a comprimised box.
61 --
62 Tim Igoe
63 tim@×××××××.uk
64 http://tim.igoe.me.uk - Personal Site
65 http://tv.igoe.me.uk - UK TV Guide
66
67 "Computers are like Air-con, open windows and they stop working!"

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Replies

Subject Author
Re: [gentoo-user] 161 UDP Constant Connections Michael Thompson <mike@×××××××××××××××.uk>