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Author Topic: Cisco experts..  (Read 1905 times)

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VXL V6

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Re: Cisco experts..
« Reply #15 on: 10 March 2012, 16:36:34 »
Quote from: cem on 08 March 2012, 13:22:22
I was curious but couldnt find a net answer, is "no ip directed -broadcast" default on cisco routers ?

Depends the vintage of the IOS.

If you have it enabled I suggest you think about using some ACL's!
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Marks DTM Calib

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Re: Cisco experts..
« Reply #16 on: 10 March 2012, 20:54:08 »
Quote from: cem on 09 March 2012, 12:29:40
Quote from: Marks DTM Calib on 08 March 2012, 16:42:23
IP directed broadcasts should be disabled by default as that is a requirement of the IEEE spec.......and given Cisco's staff wrote most of the layer three ones...

thanks Mark..  :y

from what I see (I did some search) new models have this property enabled by default.. old models not.. but no detailed info on  which models which year.. :-\

Mmmm, not to spec and not liked by most operators either as its easy to flood a network using such schemes!
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cem_devecioglu

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Re: Cisco experts..
« Reply #17 on: 10 March 2012, 23:11:01 »
Quote from: Marks DTM Calib on 10 March 2012, 20:54:08
Quote from: cem on 09 March 2012, 12:29:40
Quote from: Marks DTM Calib on 08 March 2012, 16:42:23
IP directed broadcasts should be disabled by default as that is a requirement of the IEEE spec.......and given Cisco's staff wrote most of the layer three ones...

thanks Mark..  :y

from what I see (I did some search) new models have this property enabled by default.. old models not.. but no detailed info on  which models which year.. :-\

Mmmm, not to spec and not liked by most operators either as its easy to flood a network using such schemes!

sorry I caused misunderstanding..
 
original parameter is "no ip directed -broadcast" if you enable it , there wont be any broadcast towards a specific ip , so it must be enabled :y
 
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tomh

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Re: Cisco experts..
« Reply #18 on: 11 March 2012, 06:44:53 »
Hi Cem,
this was disabled by default in IOS 11.3 iirc and is disabled in all versions since. this was done to reduce dos attacks using the directed broadcast as a reflector. It is starting to be enabled in a lot of places again as it is a required function to allow wake on LAN across subnet boundaries.

cheers

Tom
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cem_devecioglu

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Re: Cisco experts..
« Reply #19 on: 11 March 2012, 09:14:54 »
Quote from: tomh on 11 March 2012, 06:44:53
Hi Cem,
this was disabled by default in IOS 11.3 iirc and is disabled in all versions since. this was done to reduce dos attacks using the directed broadcast as a reflector. It is starting to be enabled in a lot of places again as it is a required function to allow wake on LAN across subnet boundaries.

cheers

Tom

 :y :y :y
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