Ok, according to Stevens (TCP/IP Illustrated Vol 1), the ICMP Ping Packet
looks like this:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Okay, so ICMP doens't specify a TTL on it's own. Doesn't IP by itself
have a TTL of 255?
Maybe i'm missing something.
Tim
On 11 Apr 2002 01:26:56 -0400, [EMAIL PROTECTED] ("Joseph
Ezerski") wrote:
>Ok, according to Stevens (TCP/IP Illustrated Vol 1), the ICMP Ping Packet
>looks like this:
>
Re: Ping times? Am i missing something [7:41151]
> Okay, so ICMP doens't specify a TTL on it's own. Doesn't IP by itself
> have a TTL of 255?
>
> Maybe i'm missing something.
>
> Tim
>
> On 11 Apr 2002 01:26:56 -0400, [EMAIL PROTECTED] ("Joseph
>
Timoue (timeout!? ;-)
IP TTL is a reverse hop count. The sender sets it to some large number like
255 or 64 or 32 (depending on the OS). Each router decrements it by one. If
that causes the TTL to become zero, then the packet is dead. The router
discards it. The goal is to stop a packet from t
Okay, I'm much clearer on this now. So in reality, the IP TTL
doesn't really measure anything anymore, we just need to make sure our
routers decrement it so that a box getting an IP packet with 0 will
discard it any not let it float around the networka aimlessly.
Thanks for the help. Much ap
5 matches
Mail list logo