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Forum Discussion
FVS336G changes WAN MAC address based on connectivity - how to disable this?
There is a highly annoying feature of this router I would like to disable. When the router loses internet connectivity, it appears to change its WAN MAC address to a "dummy" address of "00:de:ad:xx:x...
That doesn't sound right and might indicate a hardware issue with the WAN port (or on ISP device), some units do this to indicate an error (https://en.wikipedia.org/wiki/Hexspeak#Notable_magic_numbers).
Are you sure it's coming from the FVS? No other device connected? Can you do a packet capture from the WAN side of the FVS and verify that the source MAC address on frames coming from the FVS? You can do WAN packet captures from Monitoring -> Diagnostics.
One thing I did find while browsing around the CLI: There are references to the de:ad address on the loopback interface. Here is the output of "util routing_table_ipv6":
::1/128 :: U 0 0 1 lo fc00::/128 :: U 0 0 2 lo fc00::1/128 :: U 0 0 1 lo fe80::/128 :: U 0 0 2 lo fe80::/128 :: U 0 0 2 lo fe80::/128 :: U 0 0 2 lo fe80::2de:adff:fe10:7500/128 :: U 0 0 1 lo fe80::2de:adff:fe10:7501/128 :: U 0 0 1 lo
Note the IPv6 loopback has numerous addresses, one of which has the exact same value as the MAC address listed in the modem screenshot (00:de:ad:10:75:00). As to why a loopback address on the FVS is showing up in the ARP tables of other devices..... no idea.
Another development: with port mirroring enabled, a packat capture on the mirrored port shows the following IPv6 broadcast packets send from the FVS:
02:00:42.820407 de:ad:de:ad:de:af > 33:33:00:00:00:02, IPv6, length 70: fe80::2de:adff:fe10:7500 > ff02::2: ICMP6, router solicitation, length 16 02:00:46.820232 de:ad:de:ad:de:af > 33:33:00:00:00:02, IPv6, length 70: fe80::2de:adff:fe10:7500 > ff02::2: ICMP6, router solicitation, length 16 02:00:50.820144 de:ad:de:ad:de:af > 33:33:00:00:00:02, IPv6, length 70: fe80::2de:adff:fe10:7500 > ff02::2: ICMP6, router solicitation, length 16
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