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LAN IP and Denial of Service Attack


As I mentioned to you about your DoS attack problem in the "Change the LAN IP of the Actiontec MI424WR FiOS Modem/Router " thread, you can't change the LAN IP of your router to defeat this attack . . . unless the attack originated from within your own network. If that's the case, you should eliminate the problem from within your network, rather than changing the LAN IP of the router, because the culprit can easily determine the new IP and attack it again.

Wikipedia has a full description of this type of attack:

Usually, DoS attack is used to deprive other users of a service; for example, a web service. It does so by using tons of computers (BotNet) to retrieve web pages from a web server, overloading it. Even changing a WAN IP is typically useless against such an attack, because the attack usually uses the domain name. Unless people accesses your service strictly through the IP address, you can't stop it by changing your WAN IP.

Perhaps you can explain more about your problem. Are you running a service that someone is attacking? Why do you think changing your router LAN IP will do any good against this attack?

Chieh Cheng
Thu, 03 Jun 2010 16:12:07 +0000

no,if I can change my IP that would solve the problem

Sat, 19 Jun 2010 19:16:16 +0000

Change your external (WAN) IP? If you have dynamic IP address, then you just have to turn off your modem for a few minutes and turn it back on. Your ISP's gateway will automatically assign you a new IP. If you have static IP, then you'll have to contact your ISP to get a new IP assignment.

Chieh Cheng
Sun, 20 Jun 2010 05:22:41 +0000

On older routers, just changing the Mac address and turning it off and back on would give you a new IP address. However, I am wondering if these new routers/modems work the same, as I have read on various forums that Verizon Fios gives complications. I keep reading various opinions and seems like I can not find a straight answer.

I know with Comcast, and an older router I had with them, I was able to do the login to the router, change the mac address, turn it all off a couple minutes and turn it on to have a new IP address..

I wonder if such a method really works with Verizon FIOS as I will have that in July this year..

Tony Woodcock

Anthony Woodcock
Mon, 28 Jun 2010 20:29:11 +0000

I don't have to change the MAC address on my Verizon FIOS modem router to change the IP. I just turn it off and then on again.

It would be a dream come true if your MAC address gives you the same IP. That would be like having a static IP address for a dynamic price.

Chieh Cheng
Tue, 29 Jun 2010 04:23:00 +0000

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