Settings For The Ipx Router - Lancom 1722 VoIP User Manual

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Table of Contents

LANCOM 1722 VoIP – LANCOM 1724 VoIP

Chapter 6: Linking two networks

DNS access to the remote LAN

Thanks to DNS, it is not only possible to access remote computers in a TCP/IP

network via their IP address, but also by using freely defined names.

For example, the computer with the name 'pc1.branch.company' (IP

10.0.2.10) will not only be able to access the server of the head office via its

IP address, but also via its name, 'server.head.company'. The only precondi-

tion: the domain of the remote network in the wizard must be specified.



Extranet VPN

Finally, one can decide whether access to local stations is permitted. In this

'Extranet VPN' operating mode, the IP stations do not expose their IP address

to the remote LAN, rather they will be hidden behind the VPN gateway's IP

address instead.

Therefore, the stations within the remote LAN cannot access IP stations in the

other LAN directly. For example, if a headquarters. LAN in 'Extranet VPN'

mode is hidden behind its gateway's address '10.10.2.100', and on of its IP

stations (e.g. '10.10.2.13') accesses the IP station '10.10.1.2' of the branch

office, then the branch office.s IP stations deems to be a accessed by

'10.10.2.100'. The true IP address of the accessor ('10.10.2.13') is hidden.

If two LANs shall be coupled in Extranet mode, please ensure to enter the

'outbound' Extranet IP address of the remote site, not its Intranet address.

According to the example, this was '10.10.2.100'. The appropriate netmask

for the Extranet IP address would be '255.255.255.255' then.

6.1.3