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I have about 7 branches across the country. and each time a staff is posted to another branch he has to change the configuration on the sytem.with the mobile ip i would like to know if this will work for me.
Hi sholaoni,
Thanks for your post. The short answer is "yes" you should be able to solve this issue with Mobile IP. However, mobile IP is not something that I would consider easy to implement. If you have many users doing this then the time may be worth it. If, however, you have only a handful of users, i would recommend a small Windows tool called ipswitcher-
http://www.ipswitcher.com/index.htm
Perhaps I can write a case study that shows how to do what you are interested in.
Thanks for the post,
David
Thanks for your post. The short answer is "yes" you should be able to solve this issue with Mobile IP. However, mobile IP is not something that I would consider easy to implement. If you have many users doing this then the time may be worth it. If, however, you have only a handful of users, i would recommend a small Windows tool called ipswitcher-
http://www.ipswitcher.com/index.htm
Perhaps I can write a case study that shows how to do what you are interested in.
Thanks for the post,
David
would be interested in this case study
as i have a similar situation here in aust, but being across a state and different campus's.
as i have a similar situation here in aust, but being across a state and different campus's.
I don't think that what you want is mobile IP. From what I got out of the article, mobile IP is to transfer an open connection between access points. If the access point's footprint doesn't overlap then you will drop the connection no matter what. Since you droped the connection it does not matter if you get a new IP address or not because your traffic stream has already been interrupted. I believe the main application pushing this service is VOIP or streaming video (but how many people walk around watching a video?).
What do you mean when you say "change the configuration on the system"? Are you talking about configuring a different static IP address, gateway and/or DNS server? If so then what you are looking for is DHCP at each site, not mobile IP. If it's not one of those three settings then you are looking for something different than mobile IP or DHCP.
Bill
What do you mean when you say "change the configuration on the system"? Are you talking about configuring a different static IP address, gateway and/or DNS server? If so then what you are looking for is DHCP at each site, not mobile IP. If it's not one of those three settings then you are looking for something different than mobile IP or DHCP.
Bill
Hi Bill,
Thanks for your comments.
I agree that this article could use some clarification. This is a complex topic and the article offered up all different ways of doing things. I did want to try to point out different ways of using mobile IP and I guess I succeeding in that but, in doing so, also may have left the article pretty open-ended.
Let me try to clarify a few things-
1. This article is based on Mobile IP as described in Cisco's Mobile IP configuration guide at this link:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt1/1cfmobip.htm
This is a Cisco IOS ROUTER feature and, the feature itself, has nothing to do with wireless networks. I do see how it could be used with wireless but the feature itself has nothing to do with wireless.
2. When it comes to wireless, I agree, if you don't have an overlapping footprint, you loose network connectivity and you have to reconnect to the wireless network. However, if you had Mobile IP, you wouldn't need to renegotiate your DHCP IP address.
3. The whole point of this Cisco IOS feature is that you never have to change your IP address. You have a STATIC IP address and you can move from subnet to subnet, without ever having to use DHCP, at all. Maybe for some people this is a silly feature because their DHCP works great. In that case, use DHCP. Perhaps one day, they come up with an application that requires the same IP address no matter where they are. Maybe they want to plug a laptop in and use it as a some kind of server, no matter what subnet they connect to. (picture someone traveling to each of 50 locations in a company and having the same IP address no matter where they go). But for regular users at a location - use DHCP.
4. When I said "change the configuration on the system", I was talking about changing the IP address configuration (the IP Address, subnet mask, default gateway, etc)
Again, I want to point out that this feature has nothing to do with wireless networks, per sey. This is a Cisco IOS router feature that allows you to use the same IP address no matter what subnet you travel to.
I apologize for any confusion in the article.
Thanks for reading TechRepublic!
-David
Thanks for your comments.
I agree that this article could use some clarification. This is a complex topic and the article offered up all different ways of doing things. I did want to try to point out different ways of using mobile IP and I guess I succeeding in that but, in doing so, also may have left the article pretty open-ended.
Let me try to clarify a few things-
1. This article is based on Mobile IP as described in Cisco's Mobile IP configuration guide at this link:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt1/1cfmobip.htm
This is a Cisco IOS ROUTER feature and, the feature itself, has nothing to do with wireless networks. I do see how it could be used with wireless but the feature itself has nothing to do with wireless.
2. When it comes to wireless, I agree, if you don't have an overlapping footprint, you loose network connectivity and you have to reconnect to the wireless network. However, if you had Mobile IP, you wouldn't need to renegotiate your DHCP IP address.
3. The whole point of this Cisco IOS feature is that you never have to change your IP address. You have a STATIC IP address and you can move from subnet to subnet, without ever having to use DHCP, at all. Maybe for some people this is a silly feature because their DHCP works great. In that case, use DHCP. Perhaps one day, they come up with an application that requires the same IP address no matter where they are. Maybe they want to plug a laptop in and use it as a some kind of server, no matter what subnet they connect to. (picture someone traveling to each of 50 locations in a company and having the same IP address no matter where they go). But for regular users at a location - use DHCP.
4. When I said "change the configuration on the system", I was talking about changing the IP address configuration (the IP Address, subnet mask, default gateway, etc)
Again, I want to point out that this feature has nothing to do with wireless networks, per sey. This is a Cisco IOS router feature that allows you to use the same IP address no matter what subnet you travel to.
I apologize for any confusion in the article.
Thanks for reading TechRepublic!
-David
Is this configurable on the 44XX controllers and the AP's running the LWAPP image? They don't really seem to have a true IOS.
On Ap's running the 12.3(X) IOS what is the difference between this and WDS for seamless roaming between AP's? Just being able to go from subnet to subnet?
On Ap's running the 12.3(X) IOS what is the difference between this and WDS for seamless roaming between AP's? Just being able to go from subnet to subnet?
Hi confused_15...
Thanks for your comments.
These are good questions.
The feature that I am talking about is an IOS router feature, not a wireless AP or controller feature. You are correct, the 44xx controllers really don't have the true Cisco IOS that runs on routers and switches.
The Cisco IOS Mobile IP feature that I am talking about would run on routers. This feature would allow a client to have a STATIC IP address and move from subnet to subnet without having to renegotiate an IP address, subnet mask, and default gateway using DHCP. Now, as far as the wireless AP associations, this feature has nothing to do with that. The AP's running WDS may be able to allow seamless associations (and wireless roaming) between AP's but, as I understand it, that doesn't take care of the IP addressing. With WDS and seamless roaming between AP's, you would stay on the same IP subnet. Many people put all their AP's on the same subnet so that you don't have to renegotiatie DHCP but, in a large campus, that may not always be possible.
There are so many different facets to Mobile IP. What I described is a Cisco IOS Router feature. Cisco also has Mobile Networks that allow ROUTERS to roam across the network. Then they have The Cisco Mobile client that is Mobile IP software that runs on a Windows workstation.
I appreciate your comments and good questions.
Thanks for reading TechRepublic!
Sincerely,
David Davis
Thanks for your comments.
These are good questions.
The feature that I am talking about is an IOS router feature, not a wireless AP or controller feature. You are correct, the 44xx controllers really don't have the true Cisco IOS that runs on routers and switches.
The Cisco IOS Mobile IP feature that I am talking about would run on routers. This feature would allow a client to have a STATIC IP address and move from subnet to subnet without having to renegotiate an IP address, subnet mask, and default gateway using DHCP. Now, as far as the wireless AP associations, this feature has nothing to do with that. The AP's running WDS may be able to allow seamless associations (and wireless roaming) between AP's but, as I understand it, that doesn't take care of the IP addressing. With WDS and seamless roaming between AP's, you would stay on the same IP subnet. Many people put all their AP's on the same subnet so that you don't have to renegotiatie DHCP but, in a large campus, that may not always be possible.
There are so many different facets to Mobile IP. What I described is a Cisco IOS Router feature. Cisco also has Mobile Networks that allow ROUTERS to roam across the network. Then they have The Cisco Mobile client that is Mobile IP software that runs on a Windows workstation.
I appreciate your comments and good questions.
Thanks for reading TechRepublic!
Sincerely,
David Davis
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