workstations loose connectivity to gateway periodically

Unanswered Question
Mar 7th, 2010


I'm working on a small LAN with WinXP workstations and a 2621 router as a gateway. Randomly workstations loose connectivity to the gateway. Cannot ping the router interface at fa0/0. If I repair the connection on the workstation it fixes the issue. Any ideas?



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KARUPPUCHAMY MA... Sun, 03/07/2010 - 17:30


Just clarify the below questions

1.Is your DHCP server is configured on the windows server or the router is acting as a DHCP server,

2.paste the output of the command #sh run int f0/0



bbuhlman Sun, 03/07/2010 - 17:38


The windows server is the DHCP server. Router is not acting at DHCP.

interface FastEthernet0/0

description Local LAN

ip address

ip nat inside

no ip mroute-cache

speed 100


KARUPPUCHAMY MA... Sun, 03/07/2010 - 18:09


First you need to configure ip helper-address command in f0/0 interface to forward all the DHCP request from the desktops to DHCP server.

(config)# int f0/0

(config-if)#ip helper-address 

Parallelly check the leased time in your DHCP server for this DHCP pool

bbuhlman Sun, 03/07/2010 - 18:29


The dhcp server is on the same LAN as the workstations, doesn't everyone on the LAN look at the UDP broadcasts? I added the helper address anyway and the lease time is 8 days.

johnlloyd_13 Sun, 03/07/2010 - 21:07

could we have a brief description of your LAN. i've some few questions regarding your issue:

1. are you using wireless LAN for PC/laptop connectivity?

2. is there a LAN switch between PCs and router? PC --> SWITCH --> ROUTER; if yes, what is the speed/duplex on LAN switch port?

3. what does your router syslogs shows (show log)? check the same if using LAN switch

4. kindly provide your PC tracert to LAN gateway


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