User`s guide

Chapter 5 WAN & 3G Cellular Screens
LAN-Cell 2 User’s Guide
102
" Some ISP’s (including most cellular carriers) do not acknowledge ICMP
packets on their default gateways. Choose a different IP address to check.
" When selecting an IP address for WAN Connectivity to check, choose either a
device whose status is under your control or is well known. You can use a fully
qualified domain name (FQDN) to send packets to the virtual IP address of a
host with a high-availability connection to the Internet. If the IP address or host
specified stops responding to ICMP packets the LAN-Cell’s WAN port will also
go down.
" WAN Connectivity Check packets may increase the amount of data usage on
your WAN ISP account (including 3G). If your ISP limits the amount of traffic
allowed, consider the impact of using WAN Connectivity Check on your traffic
allowance or use Cell-Sentry (Section 5.4.2 on page 118) to monitor usage.