Mark Lanctot;173957 Wrote: > Hmm? I thought it was? > > NAS (SlimServer) - SB (acting as bridge) to router, one wireless hop. > > Router/AP to another SB, wireless, 2nd wireless hop. >
Well, my bad, that will teach me to respond without reading more carefully, and I know better. Sorry. "router" confused me. A wireless access point (WAP) can be either a bridge or a router. In my network my WAP is a bridge. The SB is a Wireless Station (STA), either end device or bridge. So, let's take three cases. 1) Peer to Peer mode. Topology: SlimServer - STA(SB,Bridge) - 802.11g - STA(SB) 2) Infrastructure mode. Topology: SlimServer - STA(SB,Bridge) - 802.11g - WAP - 802.11g - STA(SB) 3) LAN topology: Computer - STA(SB,Bridge) - 802.11g - WAP - 802.11g - STA(SB) WAP - LAN - SlimServer (1) there is no routed hops and 1 wireless "hop". Hops usually mean routers (decrement TTL and forward). If you are running 11g and have good wireless connectvity you should have no issues in this mode. STA(SB) sends request to SlimServer, it flows STA(SB) direct to STA(SB,Bridge). Then the bridge function looks at the packet, sees the MAC is for the Slimserver, looks at its MAC forwarding table and sees the SlimServer is on the wired port, and forwards it out the Ethernet wired port. The SlimServer responds, sends a packet to the STA(SB,Bridge), who looks at the MAC header, sees that it needs to go wireless and sends it to STA(SB). In this case, you should get usual speed of 24 Mb/s or peak speeds of 54 Mb/s, well able to support a FLAC stream at .3-1 Mb/s plus headers. (2) there is no routed hops if the WAP is a bridge. If the WAP is a router, and the packet is STA to STA *there is no routed hop* (meaning no TTL decrement, its on the same IP subnet). There are 2 wireless access network "hops". Path in this example is the STA(SB) sends to WAP, who retransmits to STA(SB,Bridge). STA(SB,Bridge) sees the MAC is for the SlimServer which is out the Ethernet interface, and forwards it. Reply from SlimServer goes to STA(SB,Bridge), forwards to WAP, forwards to STA(SB). Since 11g has a peak bandwidth of 54 Mb/s and usual speed of 24 Mb/s, you should have no problem getting 10 Mb/s thoughput (half of the AP usual speed). (3) There is one wireless "hop" from SlimServer to SB, the usual configuration. So your example is (2), right? Given the forwarding outlined above, and a usual .11g speed of 24 Mb/s (peak speed of 54 Mb/s), and FLAC streaming at .3-1 Mb/s (plus header overhead) you should not have trouble supporting a FLAC stream from SlimServer to SB. However, if you have marginal wireless connectivity or use 11b, data rates plunge massively and this will definately be a problem. This is likely the source of connectivity problems when using topology (2). Set the WAP to .11g mode only, and check wireless strength. If necessary, buy high gain antennae for the WAP to help. Another point you made confused me too: Mark Lanctot;172337 Wrote: > I'm amazed this all works? > > Because this is a convoluted wireless arrangement. Say the SB3 wants > to send something to SlimServer. It can't do this over its crossover > cable because you've told it to use the wireless interface and bridge > the Ethernet port. So it looks for SlimServer out over the wireless > interface. > This is what I was really responding to. See my packet flow above - the Bridge determines which side the MAC address is on. I hope this fixes my reply... -- Eric Carroll ------------------------------------------------------------------------ Eric Carroll's Profile: http://forums.slimdevices.com/member.php?userid=9293 View this thread: http://forums.slimdevices.com/showthread.php?t=31850 _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/discuss
