Raspberry PI Odd Network Issue - Can't access LAN hosts

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ajobbins

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Reply # 708789 29-Oct-2012 22:44
Just managed to ping my Android phone (on Wifi) from the Pi. Only thing other than the router that works. I can ping my IP phone from a windows host, but not from the Pi. Twitter: ajobbins

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Reply # 708790 29-Oct-2012 22:45
mjb: Hmm, that's curious. I'd look at your switch. got another to swap out temporarily? Tried that yesterday. Didn't work. Twitter: ajobbins

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Reply # 708792 29-Oct-2012 22:47
ajobbins: can ping my IP phone from a windows host, but not from the Pi. a windows host, or the (problematic) windows host? Really does sounds like arp poisoning. edit: does `arp -a` list the MAC addresses of the hosts you're trying to ping? are they correct? contentsofsignaturemaysettleduringshipping

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Reply # 708798 29-Oct-2012 23:02
mjb: a windows host, or the (problematic) windows host? Really does sounds like arp poisoning. edit: does `arp -a` list the MAC addresses of the hosts you're trying to ping? are they correct? Adam-PC (192.168.1.21) at 90:a4:de:2f:00:38 [ether] on eth0 CANT PING SFDDWRT1 (192.168.1.1) at b0:48:7a:c9:b3:cb [ether] on eth0 CAN PING Media1 (192.168.1.50) at <incomplete> on eth0 CANT PING ? (192.168.1.102) at 5c:0a:5b:30:45:cd [ether] on eth0 CAN PING S685-IP (192.168.1.20) at <incomplete> on eth0 CANT PING Media1 is the Windows host that is showing the same symptoms as the Pi. I hadn't tried it as the source directly until today as it is a pain to log into. So Media1 gets the same results as the Pi above. Twitter: ajobbins

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Reply # 708802 29-Oct-2012 23:05
If 192.168.1.50 can ping 192.168.1.70 (and get an echo reply) But 192.168.1.70 does not get a echo reply when pinging 192.168.1.50. This is very odd (but not unknown). 192.168.1.70 can send to 192.168.1.50, it did it with echo reply. So arp works etc.

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Reply # 708809 29-Oct-2012 23:28
Ok I've fixed it! Looks like it was a dodgy DD-WRT firmware that was isolating each of the devices plugged into the switch from each other. Flashed a new version and it's now working as expected. Not sure why it didn't work with the Belkin router I tried yesterday. I didn't do a huge amount of testing with it tho, so I probably over looked something simple there. THANK JEBUS Twitter: ajobbins

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