Cancel my last email as I peeked at a server I set up last year w/o issue having multiple interfaces. Its working no issue. I don't recall but can you gentlemen tell me if there are any routes that need to be set? My guest VMs being on a 2nd or 3rd NIC interface can't get a IP via DHCP and when set statically cannot send/recv packets. I vaguely recall setting routes on the working box from last year but forgot :) - aurf On Nov 21, 2013, at 5:52 PM, Digimer wrote: > It's not so much hard as it is knowing all the hops in your network. If > anything along the chain has a low MTU, the whole route is effectively > reduced. > > On 21/11/13 20:20, Nico Kadel-Garcia wrote: >> This is int4eresting stuff. I do note that the "virt-manager" tool, >> and NetworkManager, give *no* insight and detailed management >> sufficient to resolve this stuff. Note also that dancing through all >> the hoops to get this working, end-to-end, is one of the big reasons >> that most environments refuse to even *try* to use jumbo frames, as >> helpful as they sometimes are to heavy data transfers. >> >> On Thu, Nov 21, 2013 at 6:58 PM, Digimer <lists at alteeve.ca> wrote: >>> On 21/11/13 18:20, aurfalien wrote: >>>> >>>> On Nov 21, 2013, at 2:45 PM, Digimer wrote: >>>> >>>>> The 'vnetX' number doesn't relate to the interface, bridge or anything >>>>> else. The vnetX number is a simple sequence that increments each time a >>>>> VM is started. So don't think that you need 'vnet6'... it can be anything. >>>>> >>>>> The 'brctl show' output from earlier showed that both vnet0 and vnet1 >>>>> were connected to br0. You can try using the bridge utils to remove them >>>>> from br0 and connect them to br6 as a test. >>>>> >>>>> -- >>>>> Digimer >>>> >>>> Well, when I remove vnet1 from br0 and add vnet1 to br1, I loose connectivity with my VMs. >>>> >>>> No biggy so I reboot my entire host. >>>> >>>> Then vnet1 show back under br0. >>>> >>>> I just don't understand enough about this to get a clue, depressing. >>>> >>>> - aurf >>> >>> Think of each bridge as if it were a physical switch. >>> >>> When you detached vnet1 from br0, you unplugged it from a switch. When >>> you attached it to br1, you plugged it into another switch. >>> >>> If there is no connection out to your network/internet on a given >>> switch, then anything plugged into that switch will go nowhere. Same >>> with bridges. >>> >>> You seemed to indicate earlier that the main connection was on br6. Is >>> this true? If so, then "switch" br6 is the switch with the "uplink" to >>> your network. Plug a VM into it and you can route out through it. >>> >>> When you rebooted the VM, the hypervisor read the definition file. That >>> definition file says to plug in the server to br0. So it makes sense >>> that the reboot reconnected it to br0. >>> >>> If you want to use jumbo frames on the br0 switch, you need to set the >>> larger MTU on the interfaces are all set to your desired MTU size. >>> >>> -- >>> Digimer >>> Papers and Projects: https://alteeve.ca/w/ >>> What if the cure for cancer is trapped in the mind of a person without >>> access to education? >>> _______________________________________________ >>> CentOS-virt mailing list >>> CentOS-virt at centos.org >>> http://lists.centos.org/mailman/listinfo/centos-virt >> _______________________________________________ >> CentOS-virt mailing list >> CentOS-virt at centos.org >> http://lists.centos.org/mailman/listinfo/centos-virt >> > > > -- > Digimer > Papers and Projects: https://alteeve.ca/w/ > What if the cure for cancer is trapped in the mind of a person without > access to education? > _______________________________________________ > CentOS-virt mailing list > CentOS-virt at centos.org > http://lists.centos.org/mailman/listinfo/centos-virt