User`s manual

User’s Manual
Arctic GPRS Router 27 Viola Systems Ltd.
Routing
These parameters are used to configure routing settings:
Act as router – Enables IP forwarding between interfaces.
Use Proxy ARP – Enables proxy ARP. May be used with Viola M2M Gateway VPN.
Static routes can be added, if some hosts or networks require static routing settings.
S-NAT
These parameters are used to configure S-NAT (source network address translation) settings.
When enabled, private IP address used in local LAN is changed to GPRS interface IP
address.
From IP – Only S-NAT connections from the defined IP address are accepted. If defined with
wildcard (0/0), all IP addresses are handled the same way (only S-NAT connections are
allowed).
D-NAT
These parameters are used to configure D-NAT (destination network address translation)
settings. When enabled, packets coming to defined GPRS interface port are forwarded to
local IP address.
Source IP – D-NAT only connections coming from IP. Wildcard 0/0 means all IP addresses
are D-NATted.
Protocol – Chooses which protocol is port forwarded. If “ANY” is chosen, other parametes
are disregarded.
Dest.port – Chooses which GPRS interface is port forwarded to local Ethernet.
Redirect to IP – Chooses where port forwarding is done to.
Redir. port – Chooses which port port forwarding goes to.
DNS Update
These parameters are used to configure dynamic DNS. Arctic can report it’s dynamic IP
address to a DNS server. The DNS Update settings are RFC2136 compliant, for example
BIND DNS server.
The server pointed by parameter “Authoritative names server” (eg. company’s own DNS
server, for example ISC BIND) must be configured to accept incoming DNS update
messages. TSIG keys can be used for better security in DNS updates