Re: [slim] Wireless bridge question
seanadams;262463 Wrote: > I am looking at our bridging implementation, and it is designed to > forward to all ports in the event of a unicast packet whose MAC is not > in its table. It is not clear to me if this is our problem or if > something else is going on, so I am hesitant to open a bug without > knowing any specifics. > > It would be helpful to know whether the access point is actually > sending the packet out to the wireless lan in the first place. To test > that, put a wireless PC on it and run ethereal. I am not sure but I > think you can monitor unicast traffic to other hosts that way without > any special setup - you probably would need to disable encryption. I was so happy getting the thing to work, that I thought of not doing any further investigations. But, as you seem to be concerned, I took my laptop and started testing. Based on my non-scientific approach, it seems that the access point (ADSL-modem w/ WLAN) is the one to blame! So, I'd say that there is no need dig further on SB3's bridging implementation. As I had windump already installed, I used it on two machines, other being on the LAN and the other on WLAN. On ADSL modem I had two IP addresses with static ARP, the other with the real one and the other with MAC broadcast. Then I changed several times the IP address where the modem should forward the WOL-packet coming from dslreports.com. Not a single packet appeared on the WLAN with the real MAC address, but when I changed the address to the broadcast MAC, they were nicely printed out on the screen of the laptop on WLAN. All packets of course were received by the PC on LAN. I will make a note for the tech guys at ADSL modem manufacturer. Best regards, Mika -- hau hau's Profile: http://forums.slimdevices.com/member.php?userid=4495 View this thread: http://forums.slimdevices.com/showthread.php?t=31850 ___ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
Re: [slim] Wireless bridge question
seanadams;262284 Wrote: > Hmm. So here's an idea: try making that static ARP entry point to the > broadcast MAC: "FF:FF:FF:FF:FF:FF". > > This is a very strange and generally inadviseable thing as if it works, > it will let someone on the internet create broadcast traffic on your > LAN. However it would be an interesting test to do, although it is > possible that your router will (justifiably) refuse to send the packet > to the broadcast MAC via a static ARP entry. However if it works then > maybe firewalling that port to only allow your remote IP to reach it > would be acceptable to you. > The idea was more than interesting to test, it also worked. Thank you very much! I will have to go thru of course the security issues. (Security by obscurity might not be enough...) The firewall allows me to restrict outside connections to my LAN, so that shouldn't be a problem. seanadams;262284 Wrote: > > Another thing to try would be to use a port redirect to send it to the > broadcast IP, usually X.X.X.255. That was my first idea, but (not surprisingly) the router configuration interface didn't allow that. Best regards, Mika -- hau hau's Profile: http://forums.slimdevices.com/member.php?userid=4495 View this thread: http://forums.slimdevices.com/showthread.php?t=31850 ___ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
Re: [slim] Wireless bridge question
seanadams;262142 Wrote: > The WOL packet is a broadcast so it shouldn't matter, but to answer your > question I believe if it doesn't know it will behave like a hub and send > it to all ports. The problem is that the packet which is sent from the internet is otherwise structured as a WOL packet, but in fact is a UDP packet sent to a certain address (unicast). (My ADSL router then forwards it internally to the specified address.) I have now used windump (tcpdump) and found out that the packet actually comes to my net and is destined to the right IP. I hope to find a PC with wireless card for the weekend to check that the packet is also sent over the air. Then, I think, it is easier to track down the problem. Cheers, Mika -- hau hau's Profile: http://forums.slimdevices.com/member.php?userid=4495 View this thread: http://forums.slimdevices.com/showthread.php?t=31850 ___ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
Re: [slim] Wireless bridge question
seanadams;172362 Wrote: > When the SB3 is operating in bridging mode, it keeps track of who is on > the ethernet side and who is on the wireless side - it knows where to > send a packet. > What happens when it doesn't know who's on which side? Reason I'm asking this, is that I'm trying to use WOL to wake up my living room PC from internet (using e.g. dslreports.com's wakeup service http://www.dslreports.com/wakeup). If I send a WOL magic packet from my local net it of course spreads via WLAN to SB3 and, as it is a broadcast packet, SB3 forwards it to the ethernet port and the PC wakes up. When I'm using the dslreports' 'service' the packet comes to my network as a _unicast_ packet. I have configured my ADSL-modem/router with static ARP for the PC, and a rule to forward UDP port 9 packets to the PC's IP address. When I've connected the PC to one of the ADSL-modem/router's ethernet ports send the packet from internet, my PC wakes up. When I place the PC on SB3's ethernet port and send the packet from the same site the PC stays powered off. In my understanding there might be two reasons for this. - Either the ADSL device forgets to forward the packet to WLAN along with all the ethernet ports, or - SB3 drops the packet as it doesn't know that the addressee is on its ethernet port. After some email exchange with the tech guys from modem manufacturer, they assure me that all packets that are distributed to the ethernet ports will also be sent to WLAN. If this is the case, then the SB3 drops the packet and I'd like to know whether it would be possible to change the behavior of SB3's IP stack in such a way, that if it doesn't know (no entry in ARP table?) the recipients 'location' on the net, it would forward the packet? Best regards, Mika -- hau hau's Profile: http://forums.slimdevices.com/member.php?userid=4495 View this thread: http://forums.slimdevices.com/showthread.php?t=31850 ___ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
