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Linksys / Cisco WRT54GR router does not add cabled LAN client to DHCP Client Table

Posted on 2009-05-15
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Last Modified: 2013-11-05
This is a Linksys Wireless-G Broadband Router with RangeBooster.

2 WIndowsXP clients connected to it via wireless can ping each other ok. However it cannot ping the WindowsXP client that is plugged in directly to router via CAT5 cable.

From my findings I noticed when I logged on the router that it only maintains clients connected to it via wireless in the DHCP Client Table. So as you might expect the cabled WindowsXP pc can ping the other wireless pc. But the wireless pc cannot ping to the cabled pc because it is missing in the table.

Router firmware is on the latest available from Linksys/Cisco. Firmware Version: 1.01, Nov 11, 2005.

Question is:
Is there a way to allow pc connected directly by cable to the router to be in the DHCP client table, this way all the computers on my network can actually talk to each other?

I've also considered open source alternatives such as http://www.wrtrouters.com as there might be more features but new to this.
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Question by:exhaust
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Kerem ERSOY earned 500 total points
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Hi,

TCP/IP communication is like looking someone in the mirror. If you can see him it means that he could see you :) So if you can ping the wireless computers from the wired XP it means that wireless clients can ping the Wired XP too. But since XP pings the wireless clients and not vice versa it means that the firewall over the wired XP does not allow for ping (icmp requests) Check the firewall over the XP or ddisable it for a moment.

Another problem you say is "it seesm to you that it does not manage the wired but it manages wireless" seems to me  that you can not see the wired computer in the router's DHCP table. It means it uses a manual IP address and does not get its IP address through DHCP over the Linksys.
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by:Kerem ERSOY
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> Is there a way to allow pc connected directly by cable to the router to be in the DHCP client table, this
> way all the computers on my network can actually talk to each other?

In fact this is not necessary at all. If all the computers are in the same subnet it is enough for them to be able to communicate. In fact DHCP is not a protocol about communication it is jut assigns them IP addresses.
You might prefer to have some PC having a fixed address in a number of situations:
- If you're running specific Hardware or software the you access over internet and it is needed to be at a certain address.
- If the computer in question (in TCP/IP jargon called a host) is a server and everybody needs to know that it is always accessed from some defined address etc.
- The assigned address belongs to the router and everybody need to know it otherwise they can not access internet.

But there are some certain rules governing IP address allocation to a host.
- The beginning and endin addresses of all subnets are reserved and used for special purpose and the assigned address should not be one of them.
- The assigned address must not be conflicting with another host in your subnet or else this results in both computers to stop communication and printing a address conflict error. If one of the conflicting devices is your router it might shutdown tyour internet traffic till you reboot and correct the situation.
- The manual address must be outside of your DHCP pool such that if your DHCP is assigning addresses in the range ong 192.168.1.10-192.268.1.254 then the address of the fixed device shold ne 192.168.1.2 to 192.168.1.9 (1.1 is reserved for router)

> I've also considered open source alternatives such as http://www.wrtrouters.com as there might be > more features but new to this.

It wont give you more functions in your use but will be supported and robust but only if you know how to manage them. I won't suggest them to a novice user. Since there can be lots of things during flashing etc which would render your router useless easily if something goes wrong.
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by:exhaust
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WinXP firewall is already disabled, ICMP traffic all allowed on the cabled pc.

When I get a timeout when pinging from wireless to wired pc, isn't router NOT forwarding the traffic, such that it does not know how to route it because the wired pc is not in it's table. Since both pc are in the same 192.1.1.x subnet (masked at 255.255.255.0) router really acts as a switch at this point only needing to forward at the data layer 2 (ip address to mac address mapping). But the fact that it's missing from it's "switching table" it doesn't know how to forward the ping.
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