On Tue, Apr 14, 2020 at 2:43 PM Macs R We <[email protected]> wrote:
> Next step: > > You mention having multiple iMacs. Does this happen on all of them, or > only on one of them? > > Try "washing" your DSL modem <http://www.macsrwe.com/blog/?p=38>. I know > it sounds like voodoo, but these DSL units are damn freaky. (I'm > envisioning a bug where the modem may have a reserved address configured > for the problem iMac, and/or may be disturbed to changes in the MAC address > environment for it.) > Sounds reasonable > > Try logging into your router with a browser. See if it keeps some sort of > log, and what it has been saying about these connection attempts. Look at > its list of attached devices, and check for any discrepancies (e.g., your > iMac still showing up on its native jack even though it is gone). > Will try and post back > > > On Apr 14, 2020, at 10:41 AM, Jeff Weinberger <[email protected]> > wrote: > > On Tue, Apr 14, 2020 at 1:37 PM Macs R We <[email protected]> wrote: > >> Oh, yeah. >> >> The big question: have you tried connecting the Mac to a different port >> on the switch? >> > > Good question and yes, I've tried all the open ports and even switched the > iMac with other devices so I was connecting it to ports I know work. > >> >> When the IP address flashes up, does it start with the assigned range for >> your router (usually 192.168…, or 10…, or 172.16…), or does it begin with >> 169.254...? >> > It starts with 192.168...which is the assigned range by the router > > >> >> What brand and model is your router? >> > > It's whatever cable modem/router/wifi combination that came from my > Verizon ISP service > > >> >> >> >> On Apr 14, 2020, at 10:27 AM, Jeff Weinberger <[email protected]> >> wrote: >> >> On Tue, Apr 14, 2020 at 1:12 PM qb <[email protected]> wrote: >> >>> Just to make sure: when the MacBook WORKS - you have the WiFi OFF >>> right? :-) >>> >> >> Sorry - meant to specify - yes, the wifi is off. >> >>> >>> And you mentioned other devices on the wired network - meaning plugged >>> into the SWITCH? >>> >> >> The other wired devices on the network are all plugged into the switch. >> Only the iMacs and the switch are plugged into the router. There are >> wireless devices connected to the WiFi from the router. >> >>> >>> thx >>> >>> > On Apr 14, 2020, at 1:08 PM, Jeff Weinberger <[email protected]> >>> wrote: >>> > >>> > Hi - any help here is much appreciated!! >>> > >>> > My iMac's (Retina 4K 21.5 inch Late 2015, OS/X 10.15.4) Ethernet will >>> not connect when it is connected to a switch (NetGear GS108 ProSafe 8 port >>> gigabit unmanaged switch) which is in turn connected to my router. It >>> connects fine when the iMac is connected to the router directly. Here's >>> what happens: >>> > >>> > When I connect the iMac to the router, it picks up and handles the >>> DHCP connection as you'd expect - it gets an IP address and works fine. >>> When I connect the iMac to the switch, the traffic indicator lights on the >>> switch flash as expected, then it looks (in the Network preference pane) as >>> though it got an IP address then loses it and tells me either "unable to >>> connect" or "cable disconnected." It repeats this quick >>> connect-then-disconnect about every 30 seconds and cannot maintain >>> connection. >>> > >>> > I have tried using different cables which I know work when connected >>> to other devices and to the switch, with the same outcome. If it matters, >>> this happens with both iMacs (my only desktops), but does not happen with a >>> MacBook Air (ethernet to USB-C) or any other devices on the wired network. >>> > >>> > My network settings are set to DHCP and the hardware port to automatic. >>> > >>> > I am switching to a different network configuration that will require >>> that I connect all the devices (including the two iMacs) to the switch, so >>> I need to sort this one out. >>> > >>> > Any thoughts, ideas or suggestions are very much appreciated! >>> > _______________________________________________ >>> > MacOSX-talk mailing list >>> > [email protected] >>> > https://www.omnigroup.com/mailman/listinfo/macosx-talk >>> >>> _______________________________________________ >> MacOSX-talk mailing list >> [email protected] >> https://www.omnigroup.com/mailman/listinfo/macosx-talk >> >> >> -- >> Macs R We -- Personal Macintosh Service and Support >> in the Wickenburg and far Northwest Valley Areas. >> http://macsrwe.com >> >> > -- > Macs R We -- Personal Macintosh Service and Support > in the Wickenburg and far Northwest Valley Areas. > http://macsrwe.com > >
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