There is an ip conflict

  • Thread starter Thread starter Denville Longhurst
  • Start date Start date
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Denville Longhurst

Hi

Linksys broadband wireless router (Cable broadband modem) 192.168.1.1
Wireless NOT used in this scenario (occasionally used by a 'guest' laptop -
ie my youngsters!)
Enabled as DHCP server with range 192.168.1.40 for 40 addresses ie to
192.168.1.89
Wireless SSID broadcast disabled.

Desktop PC (had it for 4 years) with static IP 192.168.1.100
TiVo (Linux) with static IP 192.168.1.4
Occasional additional PC's connected with no problems, but none at the
moment.
Nothing else on the network.

New ACER laptop connected by wire to RJ45 port on Linksys hub (internal
wireless reports no wireless connection as expected)
Configured to Obtain IP Address Automatically.

Everything (except the TiVo) running XP Pro.

All works fine, no problems .. But ...

Whenever I switch on (or it seems switch off) the laptop, my desktop PC
reports "There is an IP conflict".
Double-checked desktop and laptop TCP protocol properties (and no additional
IP's specified)
Checked both desktop and laptop using IPCONFIG:
Desktop 192.168.1.100 (as expected)
Laptop 192.168.1.41 (as expected)
ARP -a on desktop shows only 192.168.1.1 (the router) and 192.168.1.41 (the
laptop)

Ethereal (run on the desktop) during startup of the laptop gives the
following trace of ARP packets:
+00 secs Source 192.168.1.100 who has 192.168.1.1 ? tell 192.168.1.100 (this
packet before I switch on Laptop)
+43 secs Source 192.168.1.100 who has 192.168.1.1 ? tell 192.168.1.100
+50 secs Source 0.0.0.0 Dest 255.255.255.255 DHCP Request transaction ID
.....
+50 secs Source 192.168.1.1 who has 192.168.1.41 ? tell 192.168.1.1
+51 secs Source 192.168.1.1 Dest 255.255.255.255 DHCP DHCP ACK (same
transaction ID)
+ 51 secs Source 192.168.1.100 who has 192.168.1.41 ? Gratuitous ARP

By now the 'There is an IP conflict ...' warning has appeared.

Any ideas ?

Thanks,

Denville.
 
Hi

Linksys broadband wireless router (Cable broadband modem) 192.168.1.1
Wireless NOT used in this scenario (occasionally used by a 'guest' laptop -
ie my youngsters!)
Enabled as DHCP server with range 192.168.1.40 for 40 addresses ie to
192.168.1.89
Wireless SSID broadcast disabled.

Desktop PC (had it for 4 years) with static IP 192.168.1.100
TiVo (Linux) with static IP 192.168.1.4
Occasional additional PC's connected with no problems, but none at the
moment.
Nothing else on the network.

New ACER laptop connected by wire to RJ45 port on Linksys hub (internal
wireless reports no wireless connection as expected)
Configured to Obtain IP Address Automatically.

Everything (except the TiVo) running XP Pro.

All works fine, no problems .. But ...

Whenever I switch on (or it seems switch off) the laptop, my desktop PC
reports "There is an IP conflict".
Double-checked desktop and laptop TCP protocol properties (and no additional
IP's specified)
Checked both desktop and laptop using IPCONFIG:
Desktop 192.168.1.100 (as expected)
Laptop 192.168.1.41 (as expected)
ARP -a on desktop shows only 192.168.1.1 (the router) and 192.168.1.41 (the
laptop)

Ethereal (run on the desktop) during startup of the laptop gives the
following trace of ARP packets:
+00 secs Source 192.168.1.100 who has 192.168.1.1 ? tell 192.168.1.100 (this
packet before I switch on Laptop)
+43 secs Source 192.168.1.100 who has 192.168.1.1 ? tell 192.168.1.100
+50 secs Source 0.0.0.0 Dest 255.255.255.255 DHCP Request transaction ID
....
+50 secs Source 192.168.1.1 who has 192.168.1.41 ? tell 192.168.1.1
+51 secs Source 192.168.1.1 Dest 255.255.255.255 DHCP DHCP ACK (same
transaction ID)
+ 51 secs Source 192.168.1.100 who has 192.168.1.41 ? Gratuitous ARP

By now the 'There is an IP conflict ...' warning has appeared.

Any ideas ?

Thanks,

Denville.
Click to expand...
I think your problem is the expire time of the IP settings. By turning
the laptop on and off, mine has run for over a year without going off,
except for small trips once or twice a quarter, you are running into
troubles. In your Router you have a time to give the IP address before
it gets renewed. Most of us have it set to zero, meaning one day, or
even longer. I think you are seeing an error message saying 'I gave
out an IP address but now it is not answering back'.
 
Thanks for the suggestion; I regularly add and remove PC's from the network
and did exactly the same with my old laptop and I have never seen this
problem before, so I think there is something more to it.

Denville.
 
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