Steve, According to RFC-791 (ftp://ftp.isi.edu/in-notes/rfc791.txt), all that is contained in the IP header with respect to addresses is the source address and the destination address, both 32 bit fields. The routers have the task of figuring out where to send things based on the routing tables.
When you do a 'show ip route' on your routers, you can find the mask. Quick tip: You don't need any drugs for sleeping. Just read some of the RFCs. :-) Ken >>> "steve skinner" 12/20/01 07:07AM >>> go on then pris...... you have wetted my appetite ....where is the the subnet mask kept if it isnt in the ip packet ????? >From: "Priscilla Oppenheimer" >Reply-To: "Priscilla Oppenheimer" >To: [EMAIL PROTECTED] >Subject: Re: Mask in L3 Packet [7:29182] >Date: Fri, 14 Dec 2001 13:42:36 -0500 > >From its own local config. The mask isn't in the IP packet, which does >come as a surpise to some people! If this isn't what you're getting at, >just let us know....... > >Priscilla > >At 08:20 AM 12/14/01, you wrote: > >This may sound like a dumb quesion, but if I send a packet to a different > >host, where is the subnet mask? Where does a host get the subnet mask >info > >to do an AND operation? >________________________ > >Priscilla Oppenheimer >http://www.priscilla.com _________________________________________________________________ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=29776&t=29182 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
