Re: ip unnumbered [7:48894]
recall that the link between you and whomever is a two host network. if you were numbering, you would most likely use a /30. even when connecting to the internet, this link need not use public IP space. Your ISP is most likely using a static route to you, and you in turn are using a static route to them. them: ip route your public space out interface X You: ip route 0.0.0.0 0.0.0.0 interface Y this is a regular practice. IP unnumbered is even better, because then no one has to commit to or agree upon address, and no one has to waste public space. Usually, you would number your ethernet port with a public number, and you would use an ip unnumbered off that publicly addressed interface. HTH richard dumoulin wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hey guys, I have to connect a Cisco router to the internet (Worldcom) and I was told the following If your router is a CISCO model, then there is no need to assign actual IP addresses to the WAN serial interfaces since CISCO's un-numbered technology can be employed. Does this mean that I can configure IP unnumbered ethernet0 or loopback0 (with one of them having a routable IP address) and so I must configure ppp encap on the serial ?? I am a bit confused, thx for your help !! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48903t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ip unnumbered [7:48894]
You can use ip unnumbered with or without PPP, depending on how your provider is set up. You would just use ip unnumbered to the ethernet port or to a loopback interface, whichever you prefer, I prefer the loopback. *-Original Message- *From: richard dumoulin [mailto:[EMAIL PROTECTED]] *Sent: Tuesday, July 16, 2002 5:32 AM *To: [EMAIL PROTECTED] *Subject: ip unnumbered [7:48894] * * *Hey guys, *I have to connect a Cisco router to the internet (Worldcom) *and I was told *the following If your router is a CISCO model, then there is no *need to assign actual IP addresses to the WAN serial *interfaces since CISCO's un-numbered technology can *be employed. Does this mean that I can configure IP *unnumbered ethernet0 or *loopback0 (with one of them having a routable IP address) and so I must *configure ppp encap on the serial ?? * *I am a bit confused, thx for your help !! * * Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48907t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ip unnumbered [7:48894]
Chuck wrote: recall that the link between you and whomever is a two host network. And I would add to that, recall that the link is just a transit for end-to-end traffic. With the exception of network management, it doesn't matter what the network-layer addressing is on that link. It carries host-to-host traffic which is identified by the network-layer addresses of the end hosts. What I'm trying to get at is that you may be concerned because of a common misconception that the network-layer addressing changes from hop-to-hop, which it doesn't. (If you're studying for CCIE, then of course you wouldn't have that micsonception, but I don't know how far you are in your studies yet. :-) Now, network management is a concern, however. If your serial interface is unnumbered, you can't ping it or send it SNMP messages. With those functions, the serial port acts as an end host and must have a network-layer address. That's the tradeoff. As Chuck says, it's common practice to use unnumbered with static and default routing pointing to the interface, however. So many people take the tradeoff. Even though you can't ping the serial interface, you can still get a lot of info from it with the show interface command. Priscilla Oppenheimer http://www.priscilla.com if you were numbering, you would most likely use a /30. even when connecting to the internet, this link need not use public IP space. Your ISP is most likely using a static route to you, and you in turn are using a static route to them. them: ip route your public space out interface X You: ip route 0.0.0.0 0.0.0.0 interface Y this is a regular practice. IP unnumbered is even better, because then no one has to commit to or agree upon address, and no one has to waste public space. Usually, you would number your ethernet port with a public number, and you would use an ip unnumbered off that publicly addressed interface. HTH richard dumoulin wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hey guys, I have to connect a Cisco router to the internet (Worldcom) and I was told the following If your router is a CISCO model, then there is no need to assign actual IP addresses to the WAN serial interfaces since CISCO's un-numbered technology can be employed. Does this mean that I can configure IP unnumbered ethernet0 or loopback0 (with one of them having a routable IP address) and so I must configure ppp encap on the serial ?? I am a bit confused, thx for your help !! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48936t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ip unnumbered [7:48894]
Comments inline: *-Original Message- *From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] *Sent: Tuesday, July 16, 2002 1:32 PM *To: [EMAIL PROTECTED] *Subject: Re: ip unnumbered [7:48894] * * *Chuck wrote: * * recall that the link between you and whomever is a two host * network. * *And I would add to that, recall that the link is just a transit for *end-to-end traffic. With the exception of network management, *it doesn't *matter what the network-layer addressing is on that link. It carries *host-to-host traffic which is identified by the network-layer *addresses of *the end hosts. * *What I'm trying to get at is that you may be concerned because *of a common *misconception that the network-layer addressing changes from *hop-to-hop, *which it doesn't. (If you're studying for CCIE, then of course *you wouldn't *have that micsonception, but I don't know how far you are in *your studies *yet. :-) * *Now, network management is a concern, however. If your serial *interface is *unnumbered, you can't ping it or send it SNMP messages. With those *functions, the serial port acts as an end host and must have a *network-layer *address. That's the tradeoff. As Chuck says, it's common *practice to use *unnumbered with static and default routing pointing to the interface, *however. So many people take the tradeoff. Even though you *can't ping the *serial interface, you can still get a lot of info from it with the show *interface command. As Priscilla states, a ping monitor wouldn't work for the serial interface, but you can still poll the router via SNMP using a loopback or other interface network layer address for the status of the unnumbered interface. So if your monitoring system is using the output of the SNMP interface status, you can still monitor the interface. * * * *Priscilla Oppenheimer *http://www.priscilla.com * * * * if you * were numbering, you would most likely use a /30. even when * connecting to the * internet, this link need not use public IP space. Your ISP is * most likely * using a static route to you, and you in turn are using a static * route to * them. * * them: ip route your public space out interface X * * You: ip route 0.0.0.0 0.0.0.0 interface Y * * this is a regular practice. * * IP unnumbered is even better, because then no one has to commit * to or agree * upon address, and no one has to waste public space. * * Usually, you would number your ethernet port with a public * number, and you * would use an ip unnumbered off that publicly addressed * interface. * * HTH * * * * richard dumoulin wrote in message * [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... * Hey guys, * I have to connect a Cisco router to the internet (Worldcom) * and I was told * the following If your router is a CISCO model, then there is * no * need to assign actual IP addresses to the WAN serial * interfaces since CISCO's un-numbered technology can * be employed. Does this mean that I can configure IP * unnumbered ethernet0 * or * loopback0 (with one of them having a routable IP address) and * so I must * configure ppp encap on the serial ?? * * I am a bit confused, thx for your help !! * * * * * * Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48942t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: IP unnumbered [7:48894]
Depending what your provider is selling you, If the provider offers you an IP address for the WAN take, it as it makes things easier to troubleshoot. You usually use IP unnumbered on point to point links where the traffic doesn't need to use the address because it is point to point and can really go anywhere else.Or in here used for dial in connections for ISDN, where the dial in client dials the number of the router and is assigned IP addresses from dial in pool, and the WAN interface is referenced using a unnumbered loopback 0 If you are dialing to your provider, you can use the IP negotiate on the wan interface, and when you dial your provider he assigned you the address dynamically and you can NAT of this, ( This is a clever solution).. its called easy IP Kind regards. -Original Message- From: Lupi, Guy [SMTP:[EMAIL PROTECTED]] Sent: 16 July 2002 15:38 To: [EMAIL PROTECTED] Subject: RE: ip unnumbered [7:48894] You can use ip unnumbered with or without PPP, depending on how your provider is set up. You would just use ip unnumbered to the ethernet port or to a loopback interface, whichever you prefer, I prefer the loopback. *-Original Message- *From: richard dumoulin [mailto:[EMAIL PROTECTED]] *Sent: Tuesday, July 16, 2002 5:32 AM *To: [EMAIL PROTECTED] *Subject: ip unnumbered [7:48894] * * *Hey guys, *I have to connect a Cisco router to the internet (Worldcom) *and I was told *the following If your router is a CISCO model, then there is no *need to assign actual IP addresses to the WAN serial *interfaces since CISCO's un-numbered technology can *be employed. Does this mean that I can configure IP *unnumbered ethernet0 or *loopback0 (with one of them having a routable IP address) and so I must *configure ppp encap on the serial ?? * *I am a bit confused, thx for your help !! * * This E-mail is from O2. The E-mail and any files transmitted with it are confidential and may also be privileged and intended solely for the use of the individual or entity to whom they are addressed. Any unauthorised direct or indirect dissemination, distribution or copying of this message and any attachments is strictly prohibited. If you have received the E-mail in error please notify [EMAIL PROTECTED] or telephone ++ 353 1 6095000. * Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48910t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: ip unnumbered [7:48894]
Hi Chuck Could you explain the statement : Usually, you would number your ethernet port with a public number, and you would use an ip unnumbered off that publicly addressed interface. - Normally we number the port with private address I am not sure what you mean by public number here!!! Just a bit puzzled . Cheers Jas -Original Message- From: Chuck [mailto:[EMAIL PROTECTED]] Sent: Wednesday, 17 July 2002 2:15 a.m. To: [EMAIL PROTECTED] Subject: Re: ip unnumbered [7:48894] recall that the link between you and whomever is a two host network. if you were numbering, you would most likely use a /30. even when connecting to the internet, this link need not use public IP space. Your ISP is most likely using a static route to you, and you in turn are using a static route to them. them: ip route your public space out interface X You: ip route 0.0.0.0 0.0.0.0 interface Y this is a regular practice. IP unnumbered is even better, because then no one has to commit to or agree upon address, and no one has to waste public space. Usually, you would number your ethernet port with a public number, and you would use an ip unnumbered off that publicly addressed interface. HTH richard dumoulin wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hey guys, I have to connect a Cisco router to the internet (Worldcom) and I was told the following If your router is a CISCO model, then there is no need to assign actual IP addresses to the WAN serial interfaces since CISCO's un-numbered technology can be employed. Does this mean that I can configure IP unnumbered ethernet0 or loopback0 (with one of them having a routable IP address) and so I must configure ppp encap on the serial ?? I am a bit confused, thx for your help !! Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=48958t=48894 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
