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Announcing the release of Fedora 18 AlphaAnnouncing the release of Fedora 18 AlphaPosted Sep 18, 2012 20:20 UTC (Tue) by zlynx (subscriber, #2285)In reply to: Announcing the release of Fedora 18 Alpha by drag Parent article: Announcing the release of Fedora 18 Alpha
I'd like NM to grow a nice way to do bonded interfaces between wifi and ethernet. Having a setup with a failover bonding so the wifi takes over on the same IP when I disconnect the Ethernet is a great thing, but I haven't had that working since I last ran Gentoo in 2007.
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Announcing the release of Fedora 18 Alpha Posted Sep 18, 2012 21:30 UTC (Tue) by blitzkrieg3 (subscriber, #57873) [Link]
The problem I see with this is that there is no way to know if both interfaces are on the same subnet.
Announcing the release of Fedora 18 Alpha Posted Sep 18, 2012 21:54 UTC (Tue) by zlynx (subscriber, #2285) [Link]
There are a couple of ways.
You could do an ARP probe to see if the DHCP server or gateway of one of the other connected devices was available. Or even ARP for the other interface IP.
You could just look at the DHCP server to see if the same one is available on both interfaces.
If the interface turns out to be on the same network go ahead and add it to the bond.
The ARP or DHCP probing would also be a good way to add locations to NetworkManager.
Or better yet, some kind of LocationManager that could use connected network information, WiFi scan results, BlueTooth, GPS, compass and/or inertial sensor data to track location.
Announcing the release of Fedora 18 Alpha Posted Sep 19, 2012 3:58 UTC (Wed) by ebiederm (subscriber, #35028) [Link]
The standard way to detect that bonding is ok, is to do lacp.
There are other valid cases where two interfaces on the same network are ok but 802.3ad let boths sides no you are bonded, and is specified to allow for auto-configuration of bonds.
There are other games you can play but you should start with 802.3ad.
Announcing the release of Fedora 18 Alpha Posted Sep 19, 2012 4:12 UTC (Wed) by zlynx (subscriber, #2285) [Link]
I don't want a bond for sharing bandwidth, so it does not matter that the other side knows about it. I want the bond for fail-over only so that when the Ethernet disconnects it falls back to wireless. There's a mode for that in Linux.
Announcing the release of Fedora 18 Alpha Posted Sep 18, 2012 22:59 UTC (Tue) by josh (subscriber, #17465) [Link]
Does that actually *work* with most network setups? Seems unlikely to work with the standard configurations of most personal router configurations, let alone corporate networks in which wired and wireless typically connect to different infrastructures entirely.
Announcing the release of Fedora 18 Alpha Posted Sep 19, 2012 4:23 UTC (Wed) by zlynx (subscriber, #2285) [Link]
Why would a personal router not let it work? It worked in 2007. The hard-wired Ethernet and the WiFi are on the same IP network. The router acts as a bridge.
And where I work, which is a corporation although small, we have a similar setup. In fact, I think we are using some ordinary Linksys consumer thing for the office.
With the bond in fail-over mode, when the bond detects that the primary link (in this case Ethernet) goes down it sends ARPs out on the second link (WiFi) to update the ARP tables of all the bridges, switches and interfaces sending it traffic.
So it may lose a packet or two but TCP/IP quickly recovers.
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