Operation Manual

KEN! Internet
KEN! – 5 KEN! for the Network Specialist 101
– The IP host and DNS addresses to the Internet are
assigned to the KEN! Service PC dynamically by the
Internet provider (IPCP).
– The IP header is converted between its dynamic ad-
dress and internal address on the KEN! Service PC.
– KEN! Service sets the default route 0.0.0.0 of the
KEN!Service PC (only!) to “AVM KEN PPP over ISDN”
(192.168.114.254).
IP Name Resolution on the KEN! Service PC
IP name resolution translates domain names like
www.avm.de into IP addresses and is performed by DNS
servers in the Internet. The KEN! proxy and E-mail servers re-
quire name resolution, just as other Internet applications on
the KEN! Service PC or KEN! Client PC.
• KEN! contains its own DNS server, which can perform
name resolution in the entire network on behalf of the
Internet provider’s DNS server. This server is activated
in the default configuration as long as no other DNS
server is already activated on the KEN! Service PC. The
KEN! DNS server is registered automatically in the Win-
dows network settings of the KEN! Service PC.
• The KEN! DNS server makes note of the names already
resolved over the course of the KEN! service and an-
swers questions about these addresses locally. A DNS
pass list or DNS filter list can be activated as well in or-
der to control direct DNS inquiries.
• The KEN! DNS server performs the actual name resolu-
tion using the DNS servers specified in the advanced
settings (“KEN! Internet / Advanced Settings / Fixed
DNS Server”). The KEN! E-mail and proxy services re-
solve names in the same way when the KEN! DNS server
is not activated.
• Every time it establishes a connection via PPP (IPCP),
KEN! determines the IP address of the Internet provid-
er’s DNS server. KEN! forwards to this DNS server all
DNS inquiries sent to the IP addresses internal to KEN!
Service, 192.168.114.252 and 192.168.114.253. These