
You can configure the following parameters:
Default TTL
If you can not reach certain sites in the Internet (a »ping« is answered with the message »destination unreachable«) it may be meaningful to
increase the »TTL« parameter (default is 64) and specify that all PCs configured via DHCP to be re-assigned configuration from the DHCP
server (or simply restart your pcs).
MTU
The »MTU« parameter is used for defining the data packet size used in the LAN. Only packets with a maximum »payload« of 1452 bytes can
be transported via a DSL Internet portal (when the PPPoE protocol is used, for example with T-Online). Packets in the PABX system should
not be first split up and reply packets not re-assembled. It is therefore expedient to use an »MTU« of 1452 bytes to achieve the greatest possi-
ble data throughput rate for the DSL connection. This may, however, result in the data transfer rate in the LAN being reduced slightly.
DHCP lease time
The lease time is the time (in seconds) for which a LAN client receives an assigned IP address before that address is fetched and returned to
the DHCP server address pool. A LAN client can extend the lease time automatically.
Default gateway
You should enter 0.0.0.0 (place holder for the PABX system IP address) as the »default gateway« if Internet access it to be provided via the
PABX system.
Domain suffixes
The parameters »Domain Names« and »DNS Server« should only be configured when you operated a DNS server within the LAN.
Netbios Name Servers
The »Netbios Nameserver« parameter is used for the name definition for Windows PCs when you use a WINS server in the LAN. This para-
meter should only be configured when you operate a WINS server in the LAN.
Time Servers
The parameter »Time Servers« is used for announcing the IP address for the »Time leasee« when your PCs direct (Windows XP, Linux) the
NTP (Network Time Protocol).
DNS Servers
DNS queries from computers in the LAN are normally forwarded to one or more external DNS servers by the DNS proxy. The addresses for
the external DNS servers can be obtained dynamically, or can be permanently configured in the router. Addresses can be input at three DNS
servers to reduce online time.
DHCP server and IP addressing
PCs can be provided with a major portion of the configuration required for LAN and Internet access via the DHCP (Dynamic Host Configu-
ration Protocol). The DHCP server integrated into the PABX is capable of supplying corresponding configurations to up to 100 PCs clients.
IP addresses are dynamically allocated to the clients. The DHCP server task of the PABX system is activated in the initial status of the PABX.
You can configure the integrated DHCP server under »Network address allocation«.
You can configure the first IP address assigned by the DHCP server. The required number of IP addresses is assigned to the PCs (DHCP
clients) in ascending order. There are always 11 additional IP addresses reserved for DHCP servers for PCs integrated into the LAN via Blue-
tooth (see Page 43) or RAS (see Page 63). If the integrated DHCP server is activated the 11 IP addresses which come after the configured
DHCP address range are used for RAS clients.
When the DHCP servers are de-activated the 11 IP addresses that come after the set DHCP start address will be used for RAS clients.
If you select a configuration in which some computers receive their IP addresses via DHCP, while others use set (manually configured) IP
addresses, the following criteria must be fulfilled:
Description of the router functions
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