On 13/12/12 15:22, David Peterson wrote:
I wanted to ping the Eduroam people about EAP over WAN links. Are there considerations that can cause connectivity issues that I should be examining?
Well... maybe. EAP is lockstep, so round-trip time is a factor - if your RTT is 100ms and your EAP exchange sends 10 packets, it will take a *minimum* of 1 second to authenticate. In addition, since a given source/dest ip/port can only have 255 radius packets outstanding (because the ID field is 1 byte) a flurry of re-authentications might necessitate multiple proxy sockets (I can't remember if FreeRADIUS opens new ones for you automatically when the ID space is full). But TBH this is a pretty theoretical problem. Packet loss is an issue, because you'll then suffer retransmits and the timers for these on most supplicants are slow. So avoid lossy links. I guess in theory bit-error-rate is a factor if you have a "dirty" link, since the packet may/will fail Message-Authenticator checks and have to be retransmitted. In short - the usual list of stuff with WAN links.