I have an 871 set up at home with 2 VLANs, both of these vlans present a strange behavior where an user is unable to ping/contact another user on the same subnet, however if users are on different subnet it seems to work
According to the troubleshooting that I have done, the issue seems to be with the broadcast traffic, ARP request/reply do not reach another host on the same subnet (wireless to wireless or wired to wireless) however if the wireless device iniciates the connection to wired, it works fine.
I have tried to enable proxy arp on the different VLANs and BVI and different combinations but no sucess in order to get traffic across 2 wireless devices on the same subnet or a connection that is iniciated for a wired client to a wireless one.
Play with the native vlan but no luck either
Finally I tried enabling and disabling dot11 arp-cache but no luck
Have you had any luck with this? I'm having a problem with my 871 where traffic stops being fowarded, out the LAN ports fa0-3. If I look at the arp entries, I can see them aging:
Protocol Address Age (min) Hardware Addr Type Interface
Internet 22.214.171.124 0 0001.5c32.e781 ARPA FastEthernet4
Internet 126.96.36.199 - 001d.a2c2.f93d ARPA FastEthernet4
Internet 192.168.1.100 6 78a3.e4a1.3625 ARPA BVI1 <--------- This device is trying to ping the router
Internet 192.168.1.113 1 78a3.e4a1.3625 ARPA BVI1
Internet 192.168.1.114 7 7c6d.628d.73bd ARPA BVI1
Internet 192.168.1.115 7 9027.e4e9.390b ARPA BVI1
Internet 192.168.1.116 52 d023.db13.7be2 ARPA BVI1
Internet 192.168.1.117 8 0026.08ea.628a ARPA BVI1
Internet 192.168.1.254 - 001e.1344.64a0 ARPA BVI1
Even trying to send traffic to the router from a directly connected device isn't updating the arp table. I can fix it with a shut/no shut on the port but it goes down again in a few days. Also is it normal to see everything from BVI1, I only have one bridge group to allow traffic between the wired and wireless interfaces.
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