AirLive WH-5420CPE - Manual (Page 43)

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 WAN Port: WH-5420CPE provides 4 methods for client to access the internet. This
depends on the location and the service which the ISP provides. You need to contact
the ISP for detail information.
Some ISP/WISP has special inquire for TTL feature that did not decrease the TTL
value when pass the first router of ISP/WISP.
When using PPPoE for WAN access, WH-5420CPE provides flexible configuration for
TTL value. The default value is 255 and does not have to change in a normal situation.
You can check with your ISP/WISP if TTL value causes connection problem.