Re: TTL decrement [7:51860]

2002-08-22 Thread Persio Pucci

Chuck,

maybe I should get away from the coffee machine then :)

That was just a topic that was brought up in another Cisco newsgroup that I
sign, and I tought I've read it somewhere but couldn't remember how was it
done... anyway, thanks for the help :)

Persio
- Original Message -
From: Chuck's Long Road 
To: 
Sent: Wednesday, August 21, 2002 10:12 PM
Subject: Re: TTL decrement [7:51860]


 Well, according to RFC, TTL decrement is 1 and that's the law.

 it doesn't mean some bad boys out there do things to make TTL adjustments
 possible.

 I checked the obvious suspect - route-map set statements - and did not
find
 anything. I quickly looked elsewhere in the global config did not reveal
 anything that hit me over the head.

 That said, the only place I know for sure where a TTL can be adjusted
 manually is in the use of the ebgp multiphop command, which changes the
TTL
 from 1 to whatever you want.

 It wouldn't surprise me to learn that Microsoft or Linux routing
 implementations would permit this. Microsoft because they believe they
 should be able to do whatever they want, and Linux because the open source
 community just likes to play with the knobs. :-

 I would suggest that screwing with TTL's is not the best way to manage
 things. Why would you want to, anyway?





 Persio Pucci  wrote in message
 [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
  Folks,
 
  I remember reading somewhere that you can change the amount of units
that
 a
  router can decrement on the TTL of a received packet, but I can't
remember
  where I read it and what is the command... or maybe I am just nuts :)
 
  Does anybody knows it?
 
  Regards,
 
  Persio




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Re: TTL decrement [7:51860]

2002-08-21 Thread Chuck's Long Road

Well, according to RFC, TTL decrement is 1 and that's the law.

it doesn't mean some bad boys out there do things to make TTL adjustments
possible.

I checked the obvious suspect - route-map set statements - and did not find
anything. I quickly looked elsewhere in the global config did not reveal
anything that hit me over the head.

That said, the only place I know for sure where a TTL can be adjusted
manually is in the use of the ebgp multiphop command, which changes the TTL
from 1 to whatever you want.

It wouldn't surprise me to learn that Microsoft or Linux routing
implementations would permit this. Microsoft because they believe they
should be able to do whatever they want, and Linux because the open source
community just likes to play with the knobs. :-

I would suggest that screwing with TTL's is not the best way to manage
things. Why would you want to, anyway?





Persio Pucci  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
 Folks,

 I remember reading somewhere that you can change the amount of units that
a
 router can decrement on the TTL of a received packet, but I can't remember
 where I read it and what is the command... or maybe I am just nuts :)

 Does anybody knows it?

 Regards,

 Persio




Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=51869t=51860
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