Depending on your network, that may be a perfectly acceptable trade-off. Or you can continue to use RFC1918 addresses on your WAN links, even if they are on the public Internet (as long as you don't advertise these addresses to a peer ISP). Hey, why not - nobody on the Internet is actually interested in accessing your WAN links, they are interested in accessing your end-hosts. So as long as your end-point addressing is publicly routable, it doesn't really matter if your intermediary networks are not.
""Symon Thurlow"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Yes but then you lose troubleshooting capabilities etc. > > -----Original Message----- > From: nrf [mailto:[EMAIL PROTECTED]] > Sent: 13 October 2002 01:45 > To: [EMAIL PROTECTED] > Subject: Re: can I use a /31 subnet to the link between 2 routers eth > [7:55480] > > > Or even better, just use unnumbered interfaces. > > > ""Bolton, Travis D [LTD]"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > I would still use a /30 mask if I was using unregistered IP's. If I > > was using standard IP's then maybe I would think about using the /31. > > > > -----Original Message----- > > From: Symon Thurlow [mailto:[EMAIL PROTECTED]] > > Sent: Saturday, October 12, 2002 4:45 PM > > To: [EMAIL PROTECTED] > > Subject: RE: can I use a /31 subnet to the link between 2 routers eth > > [7:55469] > > > > > > Thanks! > > > > I stand corrected. > > > > Cheers, > > > > Symon > > > > -----Original Message----- > > From: Bob McWhorter [mailto:[EMAIL PROTECTED]] > > Sent: 12 October 2002 17:06 > > To: [EMAIL PROTECTED] > > Subject: RE: can I use a /31 subnet to the link between 2 routers eth > > [7:55460] > > > > > > Symon, > > > > Reference RFC 3021 > > > > Using 31-Bit Prefixes on IPv4 Point-to-Point Links > > > > HTH > > > > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf > > Of Symon Thurlow > > Sent: Saturday, October 12, 2002 7:59 AM > > To: [EMAIL PROTECTED] > > Subject: RE: can I use a /31 subnet to the link between 2 routers eth > > [7:55454] > > > > > > Well, if you work it out: > > > > Obviously the first three octets wil be all 1's, so if you look at the > > > last octet: > > > > 11111110 > > > > Which = 254. This only leaves you with 2 addresses per subnet, and > > since you need one address for the Network address and one for the > > Broadcast address, you no longer have any addresses you can actually > > use. > > > > A 30 bit subnet, where the last octet= > > > > 11111100 > > > > Equals 252. This means you have 4 addresses per subnet. Taking away > > one address for the Network and one for the Broadcast address, this > > leaves you one address for each end of the link. > > > > So I am not sure how you could use a /31. > > > > Symon > > > > -----Original Message----- > > From: bbfaye [mailto:[EMAIL PROTECTED]] > > Sent: 12 October 2002 14:54 > > To: [EMAIL PROTECTED] > > Subject: can I use a /31 subnet to the link between 2 routers eth > > ports. [7:55450] > > > > > > I used thought it shoul be /30 mask subnet... > > but recently I saw some guy said: use /31 subnet to save the > > address.... I really confusing me... > > ###################################################################### > > ## > > ############# > > Scanned for Viruses and Content and cleared by the Webvein Mail > > Gateway > > > ######################################################################## > > ############# > > > ######################################################################## > > ############# > > Scanned for Viruses and Content and cleared by the Webvein Mail > > Gateway > > > ######################################################################## > > ############# > ######################################################################## > ############# > Scanned for Viruses and Content and cleared by the Webvein Mail > Gateway > ######################################################################## > ############# Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=55503&t=55503 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
