That's the answer I was looking for.
It occurs to me that Chris has just described the very configuration of
thousands of corporate laptops with Wi-Fi adapters and wired NIC's on
the same LAN subnet, with the same gateway :-)
Even Microsoft spells this out as a No-No:
https://support.microsoft.com/en-us/kb/175767
"If you configure a Windows-based computer that has more than one
network adapter on the same physical network and protocol subnet, you
may experience unexpected results. ...by definition, only one adapter
may communicate on the network at a time in the Ethernet network
topology. ... Additionally, broadcast messages must be handled by each
adapter because both are listening on the same network. This
configuration requires significant overhead, excluding any
protocol-related issues."
On 4/15/2016 1:41 PM, Chris Buechler wrote:
On Fri, Apr 15, 2016 at 12:31 PM, Karl Fife <karlf...@gmail.com> wrote:
I'm bringing this up in the off chance that it is a bug. I think it might
be expected behavior but want to bounce it off a few others.
I have an installation with two fiber uplinks. Each uplink has an IP on the
ISP's single WAN subnet (e.g. one single subnet, not a pair of tunnels).
This is a temporary configuration but in the meantime I observed the
following.
In this configuration, the gateway monitoring's default settings use a
single gateway monitoring IP address (their DHCP default gateway). What I
observe is that ONE of the two interfaces will have 'unknown/pending'
gateway status. Obviously, the gateway monitoring ICMP messages for BOTH
interfaces are routing via only ONE of the two, leaving other gateway's
status unknown.
The issue isn't gateway monitoring, it's that you can't have the same
subnet on multiple interfaces and can't have multiple WANs with the
same gateway IP. There can only one one ARP cache entry for a given IP
and it will be associated with only a single interface. It's a toss up
as to which will work in that case. It's impossible to communicate
with the same IP on two diff NICs.
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