Arris 3387W Manual Do Utilizador

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will default to a class C subnet mask.

If you select 

 the 

 field displays. 

Here you enter the MAC address of the designated IP-Passthrough com-
puter.

If this MAC address is not all zeroes, then it will use DHCP to set the LAN 
host's address to the (configured or acquired) WAN IP address.

The MAC address must be six colon-delimited or dash-delimited sets of 
hex digits ('0' – 'FF').

If the MAC address is all zeroes, then the LAN host will have to be config-
ured manually.

Once configured, the passthrough host's DHCP leases will be shor tened to 
two minutes. This allows for timely updates of the host's IP address, which 
will be a private IP address before the WAN connection is established. After 
the WAN connection is established and has an address, the passthrough 
host can renew its DHCP address binding to acquire the WAN IP address.

Since both the Gateway and the passthrough host will use 

the same IP address, new sessions that conflict with existing sessions will 
be rejected by the Gateway. For example, suppose you are a teleworker 
using an IPSec tunnel from the Gateway and from the passthrough host. 
Both tunnels go to the same remote endpoint, such as the VPN access con-
centrator at your employer’s office. In this case, the first one to star t the 
IPSec traffic will be allowed; the second one – since, from the WAN, it's 
indistinguishable – will fail.