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:
>
>
> 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
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> | Type | Code | Checksum |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> | Identifier | Sequence Number |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> | Optional Data |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
>The RFC 792, does not specify a time value, other than IP TTL (at that time,
>assumed to be in units of seconds). I think it really depends on how your
>OS has implemented it. For example, on my Windows PC, the default timeout
>is 2000ms. However, there is an option you can set (-w in the windows
>world) to extend that timeout. Stevens mentions something about newer UNIX
>implementations (as of the early 90s) timing out after 20 seconds. My
>Solaris box times out after 20 s, and it is listed in the man pages as such.
>
>HTH
>
>-Joe
>
>
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>Ouellette, Tim
>Sent: Wednesday, April 10, 2002 8:13 PM
>To: '[EMAIL PROTECTED]'; '[EMAIL PROTECTED]'
>Subject: Ping times? Am i missing something
>
>
>The other day while troubleshooting an issue, I saw some pings from out
>Tivoli Netview box and it was showing ping times in the 15,000+ ms range. Is
>this possible? I though there was a limit on this particular field in the
>head. If an of our frame-format experts (Priscilla?) or sniffer gurus
>(again... Priscilla?), could point me someone I'd appreciate it. Thanks a
>bunch!
>_________________________________________________________________
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