What's up everybody? Well, I have yet again another problem going on with my computer and was hoping for some insight. A month and a half ago, I got a Linksys router and hooked up a little in-house network between my computer (a couple years old Gateway desktop with XP Pro) and my brother-in-law's (a brand new Gateway laptop with XP Home). The cable modem and router are in his room, across house. We ran cable under the house to my part of the house. I set up the network and everything worked perfect for two weeks. Then, two weeks ago, my connection stopped working. His still worked though. I thought maybe the cable connector end came loose, since I hooked all that up myself. I redid it and didn't solve anything.
So, then yesterday, I asked my network administrator here at my job for some advice after being 2 weeks without the net at home. He told me that possibly my cable provider didn't like me using a router, so I should change my mac address on the router to that of the cable modem. I did this and the router stopped working for both computers now. I turned everything off and reset and everything and the router would not work. So, now I have his laptop hooked directly connect to the cable modem, bypassing the router. Anybody have any advice? Or does anyone think that the router itself may just be malfunctioning? Thanks in advance
- N -
I am not so sure on thins but if you left your pc on all of the time and stuck a 2nd NIC into it if you have the slot you could run the net connection in one end, and then run a cat5 from your other NIC to his nic and just bridge the network cards. the only thing is that when you turn your pc off he gets disconnected......
Wow I just heard this story today from someone at work
;)
What all is attached to the router normally?
If he was still working before, the router is ok.
It WAS working for him, it was probably just some settings on YOUR pc that needed configured, or a minute possibility of a bad card/patch cable/router plug on your side, but less likely.
But changing the MAC address to the MAC address of the cable modem was what ruined it for both of you. That's not correct.
What you SHOULD have done is change it to the MAC address of YOUR ethernet card, NOT the mac address of the cablemodem! But anyway, so few ISP's care about that nowadays that it's probably not the MAC address unless your ISP is one of the minute few that even care about that.
Now you have to do a factory reset on your Linksys.
Press and hold the reset button with a pen or something small enough to go through the hole for 3 seconds or until the Red Diag Light comes on. Then when it goes off, it should be reset.
Reboot YOUR pc. When it comes up, go to Start>>RUN... and type COMMAND. Then type IPCONFIG and see if the router gave you an IP address. If it did, then its DHCP is working. Your IP should be 192.168.1.x something.
next, open your browser and try to go to a site, if it works, you're all set. If not, type: http://192.168.1.1 and see if the login screen to your linksys comes up. Log in. See if the router got an IP from your ISP through your cablemodem. If not, power down your cable modem, power down the linksys, then turn the modem on, then wait 2 minutes and turn your linksys back on. Optionally do the same with your pc.
Once your linksys gets a WAN IP from your ISP, then make sure your pc has the proper gateway typed into your settings. Go into your Network Control panel and make sure your gateway is set to 192.168.1.1. Reboot your pc if necessary.
See if it works.
If it doesn't work, do you have a green link ready light on your router where your pc is plugged in? Do you have a green link light on your ethernet card in the back of your pc? If not, then it's a bad cable or port or card. Fix as necessary.
-G
Galileo has it about covered.
Are you using a hub in your part of the
house? If your computer is connected
directly to the router, have you got it
plugged into the uplink port instead of
a normal port by mistake? (Not the port
for the CM, the uplink port for connecting
to a hub)
It is unlikly that your cableco
has done somthing which caused the
original problem of only one computer working behind the router.
>change my mac address on the router to that of the cable modem.
Bad, bad, bad. Each device on an
ethernet segment has to have a unique
mac address or it just won't work.
>and just bridge the network cards
It's not that simple, unless you are paying the
cable company for more ip addresses, you
have to do NAT(connection sharing) on the
computer that connects to the internet.
The CM will normally only allocate an ip to
and route traffic from one computer.
You actually don't need two network cards at all,
it will work with the CM, the NAT computer
and the other computers plugged into a hub,
though if the CM will talk to more than one
of the computers (eg you have registered the
MAC's of a couple of machine or the ISP dosn't
use MAC authentication) and the non-gateway
machines are using DHCP then you may have to
make sure the NAT machine is booted first so
that it grabs the net connection.
Ethernet acts as a seperate transport layer,
It delivers packets solely based on the MAC,
internet protocol rides on top of that, eg
when you send a packet to yahoo.com your
tcp-ip stack looks at it's routing table, realises
that yahoo isn't a machine on your lan, notices that
that the connection sharing device is the default
gateway, uses ARP to find the MAC associated
with the routers ip address and sends out an
ethernet packet addressed to the MAC of the router.
I use a setup with two network cards due to
paranoia about the potential for ip spoofing and
because I play with network sniffers to see how
apps work and the constant nuisance traffic from the
internet would otherwise clutter the logs.
01234567890123456789012345678901234567890
I already did this and it did nothing. I changed it to the mac address located on the router, modem, and the ethernet card. None worked. I also reset it and nothing happened. The reset I did though was the reset function in the router browser, not the physical reset, so I will try this. Hopefully that will work.But changing the MAC address to the MAC address of the cable modem was what ruined it for both of you. That's not correct. What you SHOULD have done is change it to the MAC address of YOUR ethernet card, NOT the mac address of the cablemodem! But anyway, so few ISP's care about that nowadays that it's probably not the MAC address unless your ISP is one of the minute few that even care about that.
The network was all set up properly on both computers. I did have the cables connected properly and not in the uplink slot or anything like that.
- N -
So - Just reset everything...
Start from the "Factory"...
MAC's are Unique, Ip's Not...
The Router must get config from ISP....
U must get DHCP from Router...
(and have DHCP enabled / configured for Router as a host)...
And so On....
Been there, Done that, etc...
P.S. I feel this post is a spam :wings
(all is said already)
Peace...
:sw :sw :sw
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your router probably suffered a deliberate attack from someone wanting to gain access to your home network.
to fix it, just go to two separate screens in your router setup and do the following. First, have your router reinstall its firmware. Second, you must delete completely your configuration rom file, and reinstall a back up.
The router's firmware is the operating system of the router. An attacker who tries to direct data through your router to your computer causes partial damage of this firmware. You must go to the firmware upgrade screen, and run the update utility from a bin file you get from the router maker's website.
The configuration file is also a bin file that has all of your port forwarding data, and other settings you put into the router. Completely delete this bin file, and force the router to install a new bin file that you also get from the maker's website.
Reboot the router, and enoy.
Blady where can I find out more about this style of attack please
run a google.com search for "router firmware attack" to get you started.
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