Dell Powerconnect 5524, not talking to Zyzel devices

Hi,
I have a Dell Powerconnect 5524 switch running multiple VLAN's splitting a broadband connection. We have multiple clients on the setup which all work fine but we have had 2 instances where a customer has plugged in a Zyzel cable router and it does not work. We have put a non Zyzel switch in the middle to solve the issue but the customers are complaining of packages being dropped.

 Zyzel router ZyWall USG 50, not sure what the other model is.
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coreccAsked:
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coreccConnect With a Mentor Author Commented:
I have placed a switch in between the two devices which has solved the issue.
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TimotiStDatacenter TechnicianCommented:
The ZyWalls are fairly decent devices; do you have some logs from them, and the switch?
Where are the packets dropped? Between switch and ZyWall, or anywhere else?

How does that broadband setup look like? You get an uplink from a provider, and everybody gets a DHCP/PPPoE address on it?

Tamas
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coreccAuthor Commented:
The ZyWall will not talk the the dell switch it is as though it cannot see it. If I stick a switch between them it works OK.

The Broadband is leased line and each client has a static IP address.
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TimotiStDatacenter TechnicianCommented:
Leased line in this case means ethernet, I assume?

Does "will not talk" mean that even the ethernet link will not come up? Can you post relevant port settings/config and syslog from the Dell, and possibly from the Zyxel?
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coreccAuthor Commented:
Not Ideal but putting a switch between the 2 devices has been the only thing that has worked
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