I have 2 systems networked (1-Win2k, 1-WinXP) using the Linksys phone line connection. The Win2k system has a cable modem plugged into the USB port. I have internet connection sharing turned on for the modem. I've had this setup for over 2 years. My ISP is Comcast. All of a sudden I'm getting a bunch of windows - system errors stating the system has detected an IP address conflict with another system on the network and to check the system event log. When I check the system event log it states the system detected an address conflict for IP address 68.86.108.29 with the system having network hardware address 00:01:5C:22:0D:42. When I run IPCONFIG at a command prompt, it shows address 68.86.108.29 is for my cable modem. I've talked with tech support at Comcast, and they state it appears to be a network problem. I don't see how it is a network problem as my 2 systems use the IP address 192.168.0.1 and 192.168.0.2. Comcast eventually told me to shutdown my system and unplug the modem and when I turned the modem back on it would obtain a new IP address. I did as instructed. However, when I plugged the modem back in, it obtained the same IP address. I've tried releasing it and renewing it using IPCONFIG, but keep getting the same address. Does anyone have any ideas as to why I'm having this problem and how to correct it? The problems started on Sunday, 7/6. Between when the problem started and 11:00 pm Monday, 7/7, I had the same error 215 times in the event viewer's system log. The problem seems to have slowed down, but I do still have the same error today.
Thanks in advance for your help!
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What is the mac address of your USB connection? Are you spoofing any MAC addresses on your setup? If you want to see the IP of your modem try using the 192.168.100.1 to access the modems internal page. Most cable modems use this as their diagnostic access address.
What on your network has the hardware address 00:01:5C:22:0D:42? I am assuming it is the USB ethernet adapter built into the modem. Your system may list it as the modem. However you should try tracking down this MAC address on your network. Have you asked them for the ability to check their CMTS to find out if someone has stolen your IP? They should have had you remove your internal network from the equation and even try to ping your address with your system turned off. When they said to turn it off they probably meant to have you unplug it. If they have provisioning tools they should be able to reprovision your modem and have you pull a new address. Your modems address is likely a 10.x.x.x address as most cable modems have addresses in this range. Your computer is being assigned the 68.86.108.29 through the USB connection. Your modem is a gateway device and as such it has its own external IP, the IP you are mentioning is for your computer and if someone were stealing this and causing you a conflict Comcast should have support personell who can do this. Usually, your IP will stay the same each time you release and renew unless they were to force it out of their system somehow. I have worked with several cable internet providers and am aware that IP theft does exist, however your sysmptoms may point to issues within your setup. You may want to recreate the ICS and perhaps it might be better to bridge the USB connection from the XP machine if possible. XPs ICS seems more stable in my practical experience. Remember that computers are just data processing machines, here and there they have been known to become corrupt.
I'm sorry I don't understand alot of what you asking. What is a mac address? Since I don't know what a mac address is, I don't believe I'm spoofing any mac addresses. I thought I was seeing the IP of the modem by executing IPCONFIG. How do I access the modems internal page? How do I check the hardware addresses? They did have me unplug the modem and leave it off for at least 2 hours. It is not possible to bridge the cable modem from the XP system.
Hi tamid,
This sounds like an issue with Comcast. I work for tech support for a cable internet company in Canada. When this situation occurs, it is usually from either you having an IP address set up statically or another customer on the Comcast network with an IP address that is set up statically giving you this problem. I would suggest that you contact Comcast again and ask them to troubleshoot the problem further. As for the cable modem, you are using the built-in USB adapter. My suggestion is to use a different network card which will force another IP address to see if it solves the problem.
I am going to throw out a few possibilities; this could be a problem with your ISP, it seems that they may have given the IP address you have to someone else also, doesn't happen very often and not supposed to. What did your provider say your IP address should be? The reason to ask is that if they are not using a 68.X.X.X IP address scheme, you may have someone spoofing your system for some unknown reason. This means that a hacker could be using your computer to seem to be on this "68.X.X.X" network for what ever purposes; IE spamming, DoS attacks, or just not getting caught at whatever. If this is what your ISP says is their, range then it would not be this. You may also want to turn off the "Universal Plug and Play" on both your computers. This feature has a bug that will allow a computer to "access" all network devices, if you haven't got the latest updates from M$ -- it could use the Internet as your "network". This may be causing your problem also (?). You can test this and read up on it at www.grc.com , there is also a utility to turn it off. Just some thoughts to try, these are easy and don't require much to check. Hope this helps!!
pc_user and mrclean, I was already addressing the issue as I too work for a cable internet service provider. Whether or not he was spoofing the ip was key to figuring out whether someone has stolen his IP. I don't necessarily blame this on hackers as I have seen similar issues where this was inadvertantly done by someone thinking that if they purchased an Ip they could configure it manually, or statically thus bumping the legitimate lessee of the IP address offlline. One issue I have noted with ICS is that sometimes it fails to release and renew properly especially if someone manually entered in DNS settings which in a true DHCP system has been know to cause issues where the computer mail locck onto an IP address. This was more common with win98se with ICS as it was based on 98, but the DNS system can throw your whole configuration into the trash can.
That will do it in most cases as your IP is assigned based n the mac address registered with your ISP. I was not trying to offend anyone here, I have just had to track down stolen IPs on our service before. Some of the reasons I listed above are innocuous ways that subscribers IP addresses have ben stolen. You may still want to contact your ISP because the issue that affected you may affect someone else in a few days when the DHCP server tries to assign your old IP to a new DHCP client. If someone has set themselves up statically, the next user will face the problems you averted by attaining a new IP.
Thanks for the points. Glad to have helped.
I have a Linksys wireless rounter (with 4 wired ports) and I get the same error message, it appeared when I came back from hibernating on the laptop (which uses wireless). I have tried ipconfig/renew but it says it can't be performed while media is disconnected. I managed to fix the internet on it but it does not show up or see the network. The laptop is running Windows XP Home SP1.
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by: eljasboPosted on 2003-07-09 at 10:42:21ID: 8887296
did you restart the router box to have it get a new ip address?