On Thu, Sep 20, 2007 at 11:04:04AM +1000, bill wrote: > I have a home LAN of 4 PCs and 1 laptop. > > Connected phone-line --> modem/router --> gigabit ethernet switch --> PCs ( > via CAT5 cable) > > Problem: the laptop and 3 PCs connect to the 'Net OK. > > 4th PC won't even ping the modem/router, although it did access the 'Net > properly a couple of months ago ( when I last used the PC). > > However:- > > 1) if I disconnect this PC from the ethernet switch and connect the cable > directly into the modem/router I can access the 'Net. > > 2) if I connect the laptop to the LAN cable that is normally plugged ino > the problem PC, the laptop connects to the 'Net > > 3) if I boot the problem PC from a LiveCD I can connect to the 'Net via the > switc and modem/router. > > 4) if I change the problem PC from fixed IP to "connect b DHCP" it still > wont connect. > > The problem PC has its' /etc/network/interfaces file setup correctly ( > verified against other PCs - just different IP). > > The problem PC doesn't have a firewall. > > All PCs are running Kubuntu - 6.10 in the case of the problem PC. > > The ony thing that has changed is the ethernet switch from a 10/100 to a > gigabit switch. The PC's mobo has gigabit LAN. > > All PCs have fixed IPs ( fixed to that determined automatically by DHCP). I > have changed the problem PCs IP to match that provided by the new gigabit > switch. > > There are no conflicting IPs. > > All IPs fall within the range set in the LAN portion of the modem/router. > > From above test have determined that there are no problems with the cables, > modem/router or ethernet switch. what does ifconfig show, are there rx or tx counters going up ? could also try tcpdump, i am presuming you have a switch and not a hub, but i would guess there are going to be some broadcast packets that you should pickup
what does dmesg say or syslog ? any obvious errors > > Advice please. > -- > SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ > Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html >
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