Zyxel ZyWALL USG 20 [144/185] E interface faq

ZyWALL USG Support Notes

144

E. Interface FAQ

E01. How to setup the WAN interface with PPPoE or PPTP?

First, you need to create an ISP account, which has protocol type of PPPoE or PPTP.

Then you need to create PPP interface on GUI menu Interface > PPPOE/PPTP. You

can name this PPP interface, for example „ppp0‟ (you can have ppp0~ppp11 ppp

interface, ppp12 is reserved to modem dialup interface). After that, you need to create

a policy route, which has next-hop interface set to ppp0.

E02. How to add a virtual interface (IP alias)?

To add a virtual interface, go to GUI menu Interface > Ethernet, click the “+” icon

on each interface row. For example, I want to add a virtual interface of lan1. click the

“+” icon from the interface lan1 row, and fill out the necessary fields. It will create the

virtual interface, lan1:1.

E03. Why can’t I get IP address via DHCP relay?

It requires special support from a DHCP server. Some DHCP servers would check

special fields in a DHCP discover/request and it is possible for the servers to not to

respond them. So make sure your DHCP server supports DHCP relay.

E04. Why can’t I get DNS options from ZyWALL’s DHCP

server?

There could be several reasons. If you configure a static IP on a WAN interface, you

should have custom defined DNS servers in the LAN interface or there would be no

way to get DNS servers from ISP. If the interface that provides the DNS server goes

down, the DNS server would be regarded as dead one and won‟t pass it to the LAN

PCs. So make sure all the interfaces that provide DNS server don‟t go down because

of link down, ping-check or becoming disabled.

E05. Why does the PPP interface dials successfully even its

base interface goes down?