User's Manual Part 2

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This problem mainly happens to users who use the PPPoE or Dynamic IP
Internet connection type. You need to change the MTU size (1492 by
default). In this case, go to “WAN Settings” to change the MTU value
from default 1480 to 1450 or 1400, etc.
5. Q: How do I share resources on my computer with users on
Internet through the device?
To let Internet users access internal servers on your LAN such as e-mail
server, Web, FTP, via the device, use the "Virtual Server" feature. To do so,
follow steps below:
Step 1: Create your internal server, make sure the LAN users can access
these servers and you need to know related service ports, for example, port
number for Web server is 80; FTP is 21; SMTP is 25 and POP3 is 110.
Step 2: Enter Port Forwarding (also called Port Range Forwarding on
some products) screen from device web UI.
Step 3: Complete the Start Port (also called External/Ext Port on some
products) and End Port (also known as Internal Port on some products) fields,
say, 80-80.
Step 4: Input the internal server’s IP address. For example, assuming
that your Web server’s IP address is 192.168. 0.10, then simply input it.
Step 5: Select a proper protocol type: TCP, UDP, or Both depending on
which protocol(s) your internal host is using.
Step 6: Click Enable and save your settings.
For your reference, we collected a list of some well-known service ports
as follows:
Server
Protoco
l
Service Port
Web Server
TCP
80
FTP Server
TCP
21
Telnet
TCP
23
Net Meeting TCP
1503、1720
MSN Messenger
TCP/UD
P
File Sen
d:6891
-
6900(TCP)
Voice:1863, 6901(TCP)
Voice:1863, 5190(UDP)
PPTP VPN
TCP
1723
Iphone5.0
TCP
22555
SMTP
TCP
25
POP3
TCP
110