How much "ethernet" on the bridge is working? I happened to run across this topic yesterday where it would have been really handy to bridge a VLAN trunk across a wifi bridge, but almost everything that says that it's "layer 2 transparent" is really just doing ARP proxy/masquerading of a sort, which works OK for stuff that happens to fit into WiFi framing but not other stuff.
To do real layer 2 bridging seems to require doing L2 over L3 (L2TPv3, EoIP, VPLS, or eoMPLS) but that requires a cooperating endpoint, which you don't have, so it can't be that. Aside: when I get a chance I'd like to get a config worked out to have an easily deployable L2TPv3 bridge on a pair of openwrt boxes, for when the next thing breaks. -Bill On 11/13/2015 11:39 AM, Joshua Judson Rosen wrote: > I've noticed that VirtualBox and some other VM packages include > functionality to bridge in-VM network interfaces onto the external > network through a network interface on the host machine. I get how this works > for ethernet, but it seems like they make it work for Wi-Fi, too; > given that Wi-Fi frames don't actually carry enough information to > to do bridging at the station (client) end, how the heck does this > actually work? > > The only technique with which I'm really familiar, for bridging ethernet > through an 802.11(b|a|g|n) client interface, involves running the > radio in a non-standard 4-address mode, which requires support > on the AP at the other end of the wireless link; I'm fairly certain > that's not what the VM systems are doing, because they appear to > work with bog standard APs. So what _are_ they doing? Creating > a second (hidden?) interface on VM host with identical MAC address > to the interface inside the VM, and mirroring traffic between them? > Faking it by sniffing and relaying packets at layer 3? Something else? > Maybe something about this actually did get into a companion IEEE > standard that I'm not familiar with? > -- Bill McGonigle, Owner BFC Computing, LLC http://bfccomputing.com/ Telephone: +1.855.SW.LIBRE Email, IM, VOIP: b...@bfccomputing.com VCard: http://bfccomputing.com/vcard/bill.vcf Social networks: bill_mcgonigle/bill.mcgonigle _______________________________________________ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
