Internet OK but can't access other PC

Since I added wireless networking, I can access Internet, but not the
other computer on my LAN.

My original configuration, which worked fine, was:
- ADSL modem, connected to WAN port of
- D-Link DI-804 router, with 2 hardwired connections:
- desktop PC with Windows 98 + Norton Internet Security and printers,
on 1st LAN port of router
- laptop PC with Windows ME, on 2nd LAN port of router.

The trouble started when I added:
- 3com OfficeConnect 802.11g wireless access point on 3rd LAN port of
router
- 3com 802.11g wi-fi PC-card connected to same laptop
and unplugged the cable from the router to the laptop.

Now I can ping and http the router and the access point (for
administration) from both computers, and I can reach Internet from
both computers.
The problem however is that the computers cannot see each other:
- the desktop can ping the laptop but no longer access shared folders
- the laptop cannot even ping the desktop by IP address.
Only the current PC, not both, are visible in My Network Places (on
either PC).

I have searched for a solution to this problem, and asked various
experts at work.
I have tried
- disabling DHCP on both router and AP, and setting fixed IP addresses
(all 192.168.0.x)
- creating a HOSTS file
- resetting the network parameters
- removing IPX protocol
- replacing IPX protocol
but none of this has made any difference.
I have not changed any firewall settings on either the router or NIS.

When I unplug the access point and replace the cable between router
and laptop, everything still works as before.

Does anyone have any more suggestions?

(E-Mail Removed) (David R) wrote in
news:(E-Mail Removed) om:

> Since I added wireless networking, I can access Internet, but not the
> other computer on my LAN.
>
> My original configuration, which worked fine, was:
> - ADSL modem, connected to WAN port of
> - D-Link DI-804 router, with 2 hardwired connections:
> - desktop PC with Windows 98 + Norton Internet Security and printers,
> on 1st LAN port of router
> - laptop PC with Windows ME, on 2nd LAN port of router.
>
> The trouble started when I added:
> - 3com OfficeConnect 802.11g wireless access point on 3rd LAN port of
> router
> - 3com 802.11g wi-fi PC-card connected to same laptop
> and unplugged the cable from the router to the laptop.
>
> Now I can ping and http the router and the access point (for
> administration) from both computers, and I can reach Internet from
> both computers.
> The problem however is that the computers cannot see each other:
> - the desktop can ping the laptop but no longer access shared folders
> - the laptop cannot even ping the desktop by IP address.
> Only the current PC, not both, are visible in My Network Places (on
> either PC).
>
> I have searched for a solution to this problem, and asked various
> experts at work.
> I have tried
> - disabling DHCP on both router and AP, and setting fixed IP addresses
> (all 192.168.0.x)
> - creating a HOSTS file
> - resetting the network parameters
> - removing IPX protocol
> - replacing IPX protocol
> but none of this has made any difference.
> I have not changed any firewall settings on either the router or NIS.
>
> When I unplug the access point and replace the cable between router
> and laptop, everything still works as before.
>
> Does anyone have any more suggestions?
>

Use a wireless packet sniffer and see what's happening to the packets.

Use the correct and the same NIC protocols on all the machines. For me to
get out of the problem for wired and wireless machine access, I had to
switch to NWlink IPX/SPX on all machines, with WEP enabled, otherwise I
couldn't share resouces between NT based machines. I don't know if the
protocol is an option on the Win ME and 9'x O/S(s).

You may want to try the combination of Netbeui and Netbios together as the
protocols with IPX.

http://www.bu.edu/pcsc/internetaccess/winsock2fix.html

You can use the link to fix the stack, if you start getting the 169. IP
being assigned, which is a default IP that will be assigned if the NIC
cannot get a vaild IP from the DHCP server and a reboot will not release
the IP or using IPCONFIG.

Duane

"Duane Arnold" <(E-Mail Removed)> wrote in message
news:Xns949757F44FF2Adarnold92insightbbco@63.240.7 6.16...
> (E-Mail Removed) (David R) wrote in
> news:(E-Mail Removed) om:
>
> > Since I added wireless networking, I can access Internet, but not the
> > other computer on my LAN.
> >
> > My original configuration, which worked fine, was:
> > - ADSL modem, connected to WAN port of
> > - D-Link DI-804 router, with 2 hardwired connections:
> > - desktop PC with Windows 98 + Norton Internet Security and printers,
> > on 1st LAN port of router
> > - laptop PC with Windows ME, on 2nd LAN port of router.
> >
> > The trouble started when I added:
> > - 3com OfficeConnect 802.11g wireless access point on 3rd LAN port of
> > router
> > - 3com 802.11g wi-fi PC-card connected to same laptop
> > and unplugged the cable from the router to the laptop.
> >
> > Now I can ping and http the router and the access point (for
> > administration) from both computers, and I can reach Internet from
> > both computers.
> > The problem however is that the computers cannot see each other:
> > - the desktop can ping the laptop but no longer access shared folders
> > - the laptop cannot even ping the desktop by IP address.
> > Only the current PC, not both, are visible in My Network Places (on
> > either PC).
> >
> > I have searched for a solution to this problem, and asked various
> > experts at work.
> > I have tried
> > - disabling DHCP on both router and AP, and setting fixed IP addresses
> > (all 192.168.0.x)
> > - creating a HOSTS file
> > - resetting the network parameters
> > - removing IPX protocol
> > - replacing IPX protocol
> > but none of this has made any difference.
> > I have not changed any firewall settings on either the router or NIS.
> >
> > When I unplug the access point and replace the cable between router
> > and laptop, everything still works as before.
> >
> > Does anyone have any more suggestions?
> >
>
> Use a wireless packet sniffer and see what's happening to the packets.
>
> Use the correct and the same NIC protocols on all the machines. For me to
> get out of the problem for wired and wireless machine access, I had to
> switch to NWlink IPX/SPX on all machines, with WEP enabled, otherwise I
> couldn't share resouces between NT based machines. I don't know if the
> protocol is an option on the Win ME and 9'x O/S(s).
>
> You may want to try the combination of Netbeui and Netbios together as the
> protocols with IPX.
>
> http://www.bu.edu/pcsc/internetaccess/winsock2fix.html
>
> You can use the link to fix the stack, if you start getting the 169. IP
> being assigned, which is a default IP that will be assigned if the NIC
> cannot get a vaild IP from the DHCP server and a reboot will not release
> the IP or using IPCONFIG.
>
> Duane


TEMPORARILY disable the firewall on BOTH machines and then try logging in
again. you may not have changed any settings on the firewall but the new
card in the laptop will have been given a unique ID which presumably the
firewalls have not yet been told about.

If this does not resolve then keep packet sniffing, usually though when
someone can access net but not other Pc's the "fault" is a firewall that has
not been told of the IP addresses to allow - or not the NEW ones.

Remember the firewall on BOTH pc's needs to be checked, hence the suggestion
of temporarily disabling both. Otherwise the laptop might block it's own
outgoing packets as well as the other PC being ready to block them when they
arrive. This certainly happens with zonealarm, free and Pro.

Mark