igor2930 Series User’s Guide 
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model only). The remote user will be charged the connection 
fee by the telecom. 
Check to enable Callback function
-Enables the callback 
function. 
Callback number
-The option is for extra security. Once 
enabled, the router will ONLY call back to the specified 
Callback Number. 
Callback budget
- By default, the callback function has 
limitation of callback period. Once the callback budget is 
exhausted, the function will be disabled automatically. 
Callback Budget (Unit: minutes)- 
Specify the time budget 
for the dial-in user. The budget will be decreased 
automatically per callback connection. The default value 0 
means no limitation of callback period. 
GRE over IPSec Settings 
Enable IPSec Dial-Out function GRE over IPSec -
Check 
this box to verify data and transmit data in encryption with 
GRE over IPSec packet after configuring IPSec Dial-Out 
setting. Both ends must match for each other by setting same 
virtual IP address for communication.
Logical Traffic
- Such technique comes from RFC2890. 
Define logical traffic for data transmission between both sides 
of VPN tunnel by using the characteristic of GRE. Even 
hacker can decipher IPSec encryption, he/she still cannot ask 
LAN site to do data transmission with any information. Such 
function can ensure the data transmitted on VPN tunnel is 
really sent out from both sides. This is an optional function. 
However, if one side wants to use it, the peer must enable it, 
too. 
TCP/IP Network Settings My WAN IP - 
This field is only applicable when you select 
ISDN, PPTP or L2TP with or without IPSec policy above. 
The default value is 0.0.0.0, which means the Vigor router 
will get a PPP IP address from the remote router during the 
IPCP negotiation phase. If the PPP IP address is fixed by 
remote side, specify the fixed IP address here. Do not change 
the default value if you do not select ISDN, PPTP or L2TP.
Remote Gateway IP - 
This field is only applicable when you 
select ISDN, PPTP or L2TP with or without IPSec policy 
above. The default value is 0.0.0.0, which means the Vigor 
router will get a remote Gateway PPP IP address from the 
remote router during the IPCP negotiation phase. If the PPP 
IP address is fixed by remote side, specify the fixed IP address 
here. Do not change the default value if you do not select 
ISDN, PPTP or L2TP. 
Remote Network IP/ Remote Network Mask - 
Add a static 
route to direct all traffic destined to this Remote Network IP 
Address/Remote Network Mask through the VPN connection. 
For IPSec, this is the destination clients IDs of phase 2 quick 
mode. 
Local Network IP / Local Network Mask – 
Type the local 
network IP and mask for TCP / IP configuration. You can