I have both iMac and MBP, so I thought it might be a good idea to connect MBP to office network through iMac with thunderbolt bridge. The setup is quite simple:
office server <- 1GbE -> cisco switch <- 1GbE -> iMac <- Thunderbolt -> MBP
where iMac has a bridge0 interface with en0 (1GbE) and en3 (Thunderbolt) interfaces attached.
iperf shows following performance:
iMac -> office server: ~ 940 Mbps (as expected) office server -> iMac: ~ 940 Mbps (as expected) MBP -> iMac: ~ 5.7 Gbps (wow!) iMac -> MBP: ~ 5.7 Gbps (wow!) office server -> MBP: ~930 Mbps (quite a boost to WiFi's ~160 Mbps) MBP -> office server: 70 Kbps (WTF??)
MTU doesn't seem to be a problem as I can perfectly ping office server from MBP with MTU size packets (1500). However, I'm pretty much sure that the issue must be somewhere in the configuration of iMac bridge. I would much appreciate any idea or clue where should I look.