> On 01/22/2015 05:30 PM, Jim Lewis wrote: >> >> I just realized that my wireless computers can't ping each other. >> Wireless to wired and vice versa is just fine. The IP addresses (DHCP) >> are all on the same subnet. If I switch to wired the computer can then >> ping a wired or wireless. The computers can all access the Internet at >> any time (either wired or wireless). I did some research and have >> determined the problem might be my router. >> >> I use a LinkSys E3000 which I have had for a very long time. I >> checked >> their site and looked at the Release Notes for firmware upgrades. No >> mention of this issue and so I am hesitant to perform it (I did however >> download the latest file). I got into their Live Chat and the guy said >> since the unit is no longer in warranty I would have to pay to get >> assistance. I thought about doing this, but he could not guarantee >> success and the payment is not refundable. I thought that sucked and >> told him so. >> >> So, does anyone have any ideas about how I might solve this? I am >> going >> to be rather surprised if the problem is not the router. If it matters >> here is my hardware: >> >> Fedora 14 - wired desktop >> Fedora 20 - wireless laptop >> Fedora 21 - wireless laptop (or wired) >> Fedora 21 - wireless laptop (or wired) >> Ubuntu 12.04.2 LTS - wireless (practically unusable because of Gnome 3) > > Are the wired and wireless connections on the same subnet? If so, you > may be having with the routing of packets. Simply yanking out a cable > doesn't guarantee that the default route gets changed (unless you're > using NetworkManager). > > Consider: "A" has 192.168.1.10/24 on the wired NIC and 192.168.1.100/24 > on the wireless (both NICs on the same subnet). "B" has 192.168.1.11/24 > and 192.168.1.101/24 respectively. Now, "A" sends out a ping to "B". > Which NIC does it use? It will use the default route. Odds are that's > the wired NIC. Now, if you pull "A"s cable out, the default route is > still over the wire (unless NetworkManager or you manually change it). > Hence the outgoing ping never gets sent. > > So, check the routes. On "A" with the wired cable hooked up, do a > > netstat -rn > > as root and look for the line with the "UG" in it. The value under > "Iface" is which NIC is the default one. Now pull one of cables and > repeat the netstat command. See if the route changes to the other NIC. > If it does, you should be able to ping the other nodes. If it doesn't, > you'll need to drop the wireless connection and restart it (or change > the route manually to the other NIC) and try the ping again. > > It's always dangerous to have two different physical NICs on the same > subnet because this sort of routing issue can occur. One way around it > is to use the two NICs in a mode 1 (failover) bonded pair. "bond0" > gets the IP and the network system will automatically fail over to the > other NIC if the primary goes down. > ---------------------------------------------------------------------- > - Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx - > - AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 - > - - > - "As for me, I aspire to be the Walmart Greeter in Hell." - > ---------------------------------------------------------------------- > Hi Rick, I do not ever have 2 NICs enabled on the same subnet at the same time. Whenever I want to switch from wired to wireless, or vice versa, I always use NetworkManager to disable the current interface first before enabling the other one. Note too that if this had been a mixed up NIC problem the laptop would not have been able to ping anything. Wired always works. I also always check ifconfig for the current IP. If I weren't such a wuss I would just go ahead and upgrade the firmware on my router. That might actually solve the problem. It's currently at version 1.0.02 and the latest is 1.0.06. However, I have seen these updates fail so many times (mostly at IBM) I'm too scared to try it. Jim Lewis -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
