At 08:22 PM 4/24/01, Chuck Larrieu wrote:
>I'm not sure I understand the question, or the need.
>
>The TTL field is 8 bits, which gives a max value of 255.
>
>At this point, I believe that one's only options for manipulating TTL would
>be in terms of changing default hop count maximum for IGRP and EIGRP routing
>protocols. I.e. the default distance for an (E)IGRP network is 100 ( 100
>hops ) and this can be changed to a max of 255
I would add that changing the hop count wouldn't actually manipulate the
TTL at all. The hop count value affects the routing process and helps a
router decide whether it should advertise a route. The TTL affects the
forwarding process and helps a router decide whether it should forward a
packet.
With IGRP, the Cisco IOS software enforces a maximum diameter to the IGRP
network. Routes whose hop counts exceed this diameter are not advertised.
The default maximum diameter is 100 hops. The maximum diameter is 255 hops.
To configure the maximum diameter, use the following command in router
configuration mode:
Router(config-router)#metric maximum-hops hops
Interestingly enough, this command is not mentioned in the EIGRP
documentation. It may not be supported or necessary in EIGRP. Anyone know?
Priscilla
>RFC 1812 specifies that all packets be dropped after the TTL is expired.
>This is to keep packets from floating around forever. The process is
>specifically described in terms of router behaviour.
>
>I suppose that various applications may manipulate the TTL value in various
>ways, but the fact is that the max value is still 255, and router stacks are
>generally not configurable in the way you suggest.
>
>Am I understanding your question correctly?
>
>Chuck
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of SH
>Wesson
>Sent: Tuesday, April 24, 2001 6:29 AM
>To: [EMAIL PROTECTED]
>Subject: TTL [7:1700]
>
>If I wanted to increase the TTL on a Cisco router, how can I do that?
>
>Thanks.
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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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