Re: BGP TTL

Hey abdul,

See I know the stuff, I just want to confirm with the brains in GS. So when
someone asks a basic question , is he a dumbo?
Good engineers are the ones who explains and not criticizes when someone
asks a basic question ?

There is nothing called as GOOD DOUBT or BAD DOUBT. It depends upon the
person who takes this question.
I am really worried with ur words and feeling really bad.

On Fri, Oct 21, 2011 at 5:36 PM, Routing Freak <routingfreak_at_gmail.com>wrote:

> Then buddy all OSPF update packets are sent with a TTL of 1 to their
> directly connected neighbors , so when the neighbors receive the packet ,
> decrement the TTL to 0 and drop the packet ahh. Naa this will not happen
>
> TTL decrement will happen only on outbound .
>
>
> On Fri, Oct 21, 2011 at 5:20 PM, Imran Ali <immrccie_at_gmail.com> wrote:
>
>> Hi kid,
>>
>> regardsless of data plane or control pale TTL value is reduced .
>>
>> The moment any interface receives a packet the TTL will be reduced by 1 .
>>
>> On Fri, Oct 21, 2011 at 2:25 PM, CCIE KID <eliteccie_at_gmail.com> wrote:
>>
>> > Hi fellas,
>> >
>> > I am working on BGP and i find in sh ip bgp neighbor command, the
>> incoming
>> > TTL and the outgoing TTL . I understood the outgoing TTL is the one when
>> > the
>> > control plane packets are generated , the TTL in the IP Header will be
>> 255.
>> > I find the incoming TTL to 0 . Can anyone explain me what is actually
>> meant
>> > by incoming TTL.
>>
>>
>>
>> > My understanding is the incoming TTL is the when the
>> > neighbor send u any BGP Control plane packet, the local router is
>> expecting
>> > this TTL value in the IP HEader. Am i right ?
>> > So the incoming TTL valus is 0 in my case..
>> >
>>
>> regardless of any operation , the TTL value is always present in ip
>> header
>> :-
>>
>> >
>> > Router drops a packet with a TTL value of 0. So when the control plane
>> > packet comes. it should be of TTL of 1.
>> > TTL will be only decremented on the outgoing interface and not the
>> incoming
>> > interface. THe genreal logic says that the TTL of all control plane
>> packets
>> > of all IGPS will be 1 and so when a router receives this control plane
>> > packet , it is destined to itself , it will update the OSPF or EIGRP RIB
>> > and
>> > in turn do the local computation for the best path .
>> >
>> > My question is whether the where does the TTL decrement happen ? My
>> answer
>> > is outbound and for any other control plane packet it will be destined
>> to
>> > itslef , so there will be no decrement in the TTL
>> >
>> > --
>> > With Warmest Regards,
>> >
>> > CCIE KID
>> > CCIE#29992 (Security)
>> >
>> >
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>> >
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>

-- 
With Warmest Regards,
CCIE KID
CCIE#29992 (Security)
Blogs and organic groups at http://www.ccie.net