Can the downlink device learn the uplink gateway’s ARP?
You can check the ARP table to verify that the uplink gateway’s traffic can reach
the downlink device. Also verify that the IP address and MAC address matches the
downlink device’s information in case of spoofing attacks.
If downlink device is an end device:
Figure 7
If the downlink device can correctly learn the uplink gateway’s ARP entry, go to step
6.
If the downlink device cannot correctly learn the uplink gateway’s ARP entry, go to
<OTHERS>.
Does the uplink gateway have route to network of client with
issue?
Similar to Step 4, this time, verify whether the uplink gateway knows how to route
traffic back to client. This means that if the client with issue is in network
“192.168.10.0”, the uplink gateway must have a destination address for network
“192.168.10.0”. Note that the Web GUI of static routes do not display local interface.
So if a Zyxel switch locally has an IP interface in network “192.168.10.0”, this will not
be displayed. For a more accurate routing table, use CLI instead.
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