network woes

[Lisa Kachold]

On Sat, Jan 2, 2010 at 9:08 PM, Trent Shipley <tshipley at deru.com> wrote:

> Eric Shubert wrote:
>
> > Trent Shipley wrote:
> >
> >> Eric Shubert wrote:
> >>
> >>> Trent Shipley wrote:
> >>>
> >>>> Benjamin Francom wrote:
> >>>>
> >>>>> On Tue, Dec 22, 2009 at 7:18 PM, Mark Phillips
> >>>>> <mark at phillipsmarketing.biz> wrote:
> >>>>>
> >>>>>> Trent,
> >>>>>>
> >>>>>> I ran into a similar problem today - my network slowed
> waaaaaaaaaaaaaay down
> >>>>>> on me. All I used was ping to methodically to check all the
> connections and
> >>>>>> found that a switch was reseting itself and dropping packets.
> Basically, I
> >>>>>> turn everything off, reset all the routers, cable modems, etc, and
> then turn
> >>>>>> on one piece of equipment at a time and ping to the main router to
> see if I
> >>>>>> can connect and if there is any packet loss. You can find a out a
> lot of
> >>>>>> information by being methodical and knowing your network topology.
> >>>>>>
> >>>>>> Good Luck!
> >>>>>>
> >>>>>> Mark
> >>>>>>
> >>>>>> On Tue, Dec 22, 2009 at 5:52 PM, Trent Shipley <tshipley at deru.com>
> wrote:
> >>>>>>
> >>>>>>> Somewhere my connection to the Internet is borken.  Load times take
> >>>>>>> forever.  It doesn't seem to effect the wireless client routers,
> but I
> >>>>>>> have had trouble on both the wired machines under Ubuntu 9.10 and
> >>>>>>> Windows Vista.  Sometimes the Linux machine effectively looses
> >>>>>>> connectivity with the Internet.  It comes back if I log out of my X
> >>>>>>> session and log back in ... most of the time.  I have a firewall
> router,
> >>>>>>> but effectively no household LAN since I've been too lazy to really
> >>>>>>> figure out how to configure the Ubuntu desktop machine as a primary
> >>>>>>> domain controller, then adjust it's firewall to suit.
> >>>>>>>
> >>>>>>>
> >>>>>>> I'd like an idiot friendly tool to help track this problem down,
> >>>>>>> preferably on the Linux machine which seems to experience the
> problem
> >>>>>>> most consistently.
> >>>>>>>
> >>>>>>> Baring a GUI tool friendly to mortal users, I am not above using
> the
> >>>>>>> @#$% command line and a text editor.
> >>>>>>>
> >>>>>>>
> >>>>>>> I am not too network savvy.  I have to look up the layers of the
> OSI
> >>>>>>> stack every time.  What is a reasonable diagnostic or fault tree
> for
> >>>>>>> approaching my symptoms.
> >>>>>>>
> >>>>>>> It is also worth noting that this problem seems to date back to
> >>>>>>> precisely when I upgraded from Ubuntu 9.04 to 9.10.
> >>>>>>>
> >>>>>>> ---------------------------------------------------
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> >>>>>>>
> >>>>>> ---------------------------------------------------
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> >>>>>>
> >>>>>>
> >>>>> Unplug all devices for at least one min.  Start with modem and work
> >>>>> your way up to the PC
> >>>>> The Vista and Ubuntu machines are separate machines, not a single
> dual
> >>>>> boot, right?
> >>>>>
> >>>>> tracert=windows
> >>>>> traceroute=linux
> >>>>> ---------------------------------------------------
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> >>>>> To subscribe, unsubscribe, or to change your mail settings:
> >>>>> http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss
> >>>>>
> >>>> I have "rebuilt" the network a couple of times from the modem up.  My
> >>>> suspicion is focused on the Ubuntu desktop because of the coincidence
> >>>> that the problem started with a major upgrade.
> >>>>
> >>>> Yes. We have the following on the network ... not all at the same
> time.
> >>>> * Qwest modem, outside the firewall.
> >>>> * Netgear wired/802.11g wireless router. No evident problems with
> >>>> wireless connections.
> >>>> * Ubuntu 9.10 on Dell hardware.  Wired connection. (Main suspect)
> >>>> Thinking about putting in a new Ethernet card since I have it "in
> stock"
> >>>> anyway and it's doing me no good in the box.
> >>>> * Apple notebook.  Wired connection.
> >>>> ** Windows Vista.  Have seen some symptoms.
> >>>> ** OS X.  mild symptoms.
> >>>> * Apple notebook.  Wireless.  No known symptoms.
> >>>> * Apple iMac. Wireless  No known symptoms.
> >>>> * (Occasional) HP netbook running Ubuntu 9.10 netbook remix.
>  Wireless.
> >>>>   No known symptoms.
> >>>>
> >>> That's helpful.
> >>>
> >>> I really doubt the upgrade was a cause of any kind, given that your
> >>> Apple notebook (other wired) connection also experiences problems.
> >>>
> >>> Have you tried alternate wired ports on the Netgear router? Sometimes a
> >>> single port/plug can be defective. The whole wired side of the router
> >>> might be failing as well.
> >>>
> >> I have tried swapping wires and ports.  It doesn't seem to help.
> >>
> >>
> >>> Do you have a switch you can put in place of the wireless router to see
> >>> if the problem persists?
> >>>
> >> I don't have a spare switch.  Of course switches aren't too expensive.
> >> I just don't have much use for it outside of testing unless I change my
> >> network architecture to something like,
> >> * Router
> >> ** Wired switch
> >> *** wired computers.
> >>
> >
> > I don't think that'll buy you anything, especially if the wired part of
> > your router is hosed. I would try something more like this:
> > * DSL modem
> > ** Wired switch
> > *** wired computers
> > *** wireless router
> >
> > FWIW, this isn't really the best from a security standpoint, but I don't
> > think it's any less secure than what you have now.
> >
> >
> >>> Does your DSL modem do dhcp/nat? (most do these days)
> >>>
> >>>
> >> The DSL modem definitely does dhcp.  I do not know if NAT is being done
> >> by the modem or the router.
> >>
> >
> > Probably both. That's not necessarily a problem. You don't want both the
> > DSL modem and the router providing dhcp on the same subnet though.
> >
> >
> A new router solved the problem.  Everything wired is faster.  The
> Ubuntu machine is much faster.
>
> Now back to that Fedora (virtual box): WinXP; Win7 problem.
> ---------------------------------------------------
>

Yes, I love my GIG-E cable modem, even if the thing was expensive, the code
is freely available for reverse engineers on Cisco's site, and it fails over
into a fine 8080 remo man overflow.

-- 
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