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Author Topic: DoS Attack?  (Read 1957 times)

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Gaffers

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DoS Attack?
« on: 22 February 2010, 20:44:56 »
Hi gents, one for the IT experts.  Log from the router:

INF        2010-02-22T18:40:53Z        fw,fwmon        src=58.185.12.116 dst=86.155.207.183 ipprot=1 icmp_type=3 icmp_code=3 ICMP Dest Unreachable, session terminated
INF       2010-02-22T18:40:53Z       fw,fwmon       src=66.216.1.98 dst=86.155.207.183 ipprot=1 icmp_type=3 icmp_code=1 ICMP Dest Unreachable, session terminated
INF       2010-02-22T18:40:53Z       fw,fwmon       src=86.16.47.137 dst=86.155.207.183 ipprot=1 icmp_type=3 icmp_code=1 ICMP Dest Unreachable, session terminated
INF       2010-02-22T18:40:53Z             Previous log entry repeated 1 times
INF       2010-02-22T18:40:54Z       fw,fwmon       src=66.216.1.98 dst=86.155.207.183 ipprot=1 icmp_type=3 icmp_code=1 ICMP Dest Unreachable, session terminated
INF       2010-02-22T18:40:54Z       fw,fwmon       src=98.212.30.30 dst=86.155.207.183 ipprot=1 icmp_type=3 icmp_code=13 ICMP Dest Unreachable, session terminated
INF       2010-02-22T18:40:55Z       fw,fwmon       src=86.151.251.247 dst=86.155.207.183 ipprot=6 sport=49799 dport=80 Unknown inbound session stopped
INF       2010-02-22T18:40:57Z       fw,fwmon       src=58.185.12.116 dst=86.155.207.183 ipprot=1 icmp_type=3 icmp_code=3 ICMP Dest Unreachable, session terminated
INF       2010-02-22T18:40:58Z       fw,fwmon       src=66.216.1.98 dst=86.155.207.183 ipprot=1 icmp_type=3 icmp_code=1 ICMP Dest Unreachable, session terminated

reset the ip address earlier as I found the c#@t culprit using torrents and explained what was happening and why the connection was dropping.  Was a port scan looking for an open port to his computer but now it seems to be looking for some unexplained ip address... Hence why I think it ay be DoS.

The connection is awful and it keeps forcing the modem to reboot and dropping the connection.  Any ideas?
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Plomien

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Re: DoS Attack?
« Reply #1 on: 22 February 2010, 20:50:48 »
does your firewall have a command respond to ping?
and is it turned off?
failing that respond with a ping attack back ;D
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Gaffers

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Re: DoS Attack?
« Reply #2 on: 22 February 2010, 20:52:47 »
Quote
does your firewall have a command respond to ping?
and is it turned off?
failing that respond with a ping attack back ;D

Nope I think that in modern routers they only accept pings from inside the network not from exterior by default....this 'session' hit maybe a way around it.  If it is a DoS it is having the desired effect  :'(

Misuse of IT is illegal plomein  :D :D :D :y
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STMO999

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Re: DoS Attack?
« Reply #3 on: 22 February 2010, 20:55:45 »
Quote
does your firewall have a command respond to ping?
and is it turned off?
failing that respond with a ping attack back ;D


A Pingon attack? I love star trek :y
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Gaffers

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Re: DoS Attack?
« Reply #4 on: 22 February 2010, 20:58:37 »
Quote
Quote
does your firewall have a command respond to ping?
and is it turned off?
failing that respond with a ping attack back ;D


A Pingon attack? I love star trek :y

I now have images of Steve in a Spok costume saying "eh eh eh, live long and rather prosper you git!"  ;D ;D ;D
« Last Edit: 22 February 2010, 20:59:00 by mrgaffney »
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cem_devecioglu

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Re: DoS Attack?
« Reply #5 on: 22 February 2010, 20:59:44 »
I checked from
http://ws.arin.net/whois/

very different places..

 and if you dont own a server for a bank or a web service provider attacks are meaningless.. :-/

imho it may be a virus in those places which gets your ip from the places you visit.. :-/
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Gaffers

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Re: DoS Attack?
« Reply #6 on: 22 February 2010, 21:02:09 »
Quote
I checked from
http://ws.arin.net/whois/

very different places..

 and if you dont own a server for a bank or a web service provider attacks are meaningless.. :-/

imho it may be a virus in those places which gets your ip from the places you visit.. :-/

Im thinking that too but there are 20+ computers on this net...cant be arsed to go through each one and find out who's been downloading dodgy porn  :(
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cem_devecioglu

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Re: DoS Attack?
« Reply #7 on: 22 February 2010, 21:11:54 »
Quote
Quote
I checked from
http://ws.arin.net/whois/

very different places..

 and if you dont own a server for a bank or a web service provider attacks are meaningless.. :-/

imho it may be a virus in those places which gets your ip from the places you visit.. :-/

Im thinking that too but there are 20+ computers on this net...cant be arsed to go through each one and find out who's been downloading dodgy porn  :(

 ;D dont search for another reason :y
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cem_devecioglu

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Re: DoS Attack?
« Reply #8 on: 22 February 2010, 21:13:33 »
actually if one of the pcs got worm or virus it may be bombarding your local net :-/

try a net sniffer :y
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Lazydocker

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Re: DoS Attack?
« Reply #9 on: 22 February 2010, 21:30:36 »
Quote
Quote
Quote
does your firewall have a command respond to ping?
and is it turned off?
failing that respond with a ping attack back ;D


A Pingon attack? I love star trek :y

I now have images of Steve in a Spok costume saying "eh eh eh, live long and rather prosper you git!"  ;D ;D ;D
;D ;D ;D ;D ;D ;D ;D ;D

Did you have to put that image in my head :o :o ;D ;D
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PhilRich

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Re: DoS Attack?
« Reply #10 on: 22 February 2010, 21:37:31 »
Quote
actually if one of the pcs got worm or virus it may be bombarding your local net :-/

try a net sniffer :y


Fishnet or hairnet ?  ;D ;D ;D ;D ;D ;D ;) :y
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cem_devecioglu

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Re: DoS Attack?
« Reply #11 on: 22 February 2010, 21:40:07 »
Quote
Quote
actually if one of the pcs got worm or virus it may be bombarding your local net :-/

try a net sniffer :y


Fishnet or hairnet ?  ;D ;D ;D ;D ;D ;D ;) :y


erm.. not sure, which ;D ;D :y :y
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TheBoy

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Re: DoS Attack?
« Reply #12 on: 23 February 2010, 18:59:41 »
Hmmm, wise to have ICMP type 3 open (o/g. i/c as well if you have services behind it).

The logs in question dont look too bad - I wouldn't be overly concerend, and doubt they are cause of your issue.  If I posted my f/w logs, you'd have a heart attack ;).

Also, looks suspiciously like a crappy netgear?
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Gaffers

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Re: DoS Attack?
« Reply #13 on: 23 February 2010, 22:27:24 »
Quote
Hmmm, wise to have ICMP type 3 open (o/g. i/c as well if you have services behind it).

The logs in question dont look too bad - I wouldn't be overly concerend, and doubt they are cause of your issue.  If I posted my f/w logs, you'd have a heart attack ;).

Also, looks suspiciously like a crappy netgear?

Might be, its a BT Business Hub (not my choice)

The crappy thing keeps falling over especially when more than say a dozen are connected to anyone of the 3 WLANs it manages.  Firmware then?

Getting mighty peeved, it took an hour to reboot yesterday evening and as the only one on the course who has any experience in IT (which is ironic due to the nature of the course) I get all the responsability of getting it sorted  :-/
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Kevin Wood

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Re: DoS Attack?
« Reply #14 on: 24 February 2010, 10:08:35 »
Incoming ICMP type 3s might indicate that a machine on the network is poking around trying to find open ports perhaps?

Maybe you've got a machine that's infected and generating enough outgoing sessions that the router's NAT table is filling up?

Can you look at the NAT entries on the router?

Failing that, put a machine running wireshark or similar on the same segment as the router and watch what's coming and going?

Kevin
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