On Tue, Jan 31, 2012 at 16:33, Ben Scott <[email protected]> wrote: > > On Tue, Jan 31, 2012 at 6:11 PM, Kurt Buff <[email protected]> wrote: > > It's one subnet for everything in that office, with the firewall as > > the gateway, no managed switch (I've been trying for years to get one > > there). > > Okay, so, basically, one big collision domain, one dumb switch. A > wireless access point plugged into the switch. Firewall/router > plugged into that same switch. Yah?
Broadcast domain, but yes, you are correct. I believe they've strung together a couple of switches, but not more than that. > > The machine that are unreachable are in a remote subnet - along with > > some machines that *are* reachable in that same subnet - and no other > > machine. > > Hmmm, that's interesting. Rules out most routing problems, unless > they're individual host routes. Rules out firewall misconfigurations > the same way. Rules out most data dependent problems. Which is why I was curios to pint out the routing table on the laptop. There were no anomalies on that. > > happening ... when he's wireless-only as well as wired-only > > That rules out the network transceiver, or even the medium (cable). > > Curiouser and curiouser. > > I'd still check the MAC addresses with your sniffer, make sure the > frame's it's sending are indeed addressed to the firewall/gateway. > Although I can't imagine what would cause that, at this stage. (I was > thinking a static ARP entry, but that would (again) break other things > on the same destination network.) > > Can you walk someone through getting a sniffer going on another > machine, and plugging that in between the problem laptop and the > switch? At this point I'm wondering if maybe what the sniffer on the > laptop is seeing isn't accurate (i.e., things are getting screwed up > further down in the network stack). If he wants to work on this further, I'll suggest that. He's made noises about wiping it and starting over, and that might be simplest. Kurt ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin
