User's Manual

“backup” mail exchanger for delivery, until the primary mail server becomes
functional again. In technical term, such service is called Backup Mail
Exchanger.
Q: What is PPPoE (PPP Over Ethernet)?
A: PPPoE is know as a dial-up DSL service. It is designed to integrate the
broadband services into the current widely deployed, easy-to-use, and
low-cost dial-up-access networking infrastructure. Thus, customer can get
greater access speed without changing the operation concept.
Q: What is MTU?
A: A maximum transmission unit (MTU) is the largest size packet or frame,
specified in octets (eight-bit bytes), that can be sent in a packet- or
frame-based network such as the Internet. The Internet's Transmission Control
Protocol uses the MTU to determine the maximum size of each packet in any
transmission. Too large an MTU size may mean retransmissions if the packet
encounters a router that can't handle that large a packet. Too small an MTU
size means relatively more header overhead and more acknowledgements
that have to be sent and handled. Most computer operating systems provide a
default MTU value that is suitable for most users. In general, Internet users
should follow the advice of their Internet service provider (ISP) about whether
to change the default value and what to change it to.
Appendix C Troubleshooting
This chapter is intended to help you troubleshoot problems you may encounter
while setting up and using the XAVi route. It also describes some common
hardware and software problems and gives some suggestions to troubleshoot
them.
Refresh your IP address (MS Windows)
Sometimes you will wonder what my computer’s IP is or you want to refresh
your IP address. There is a tool for this comes with Windows. For Windows
95/98/98se/ME, please click Start > Run, enter winipcfg and click OK. Select
the correct Network Adaptor, click release all to release all current
configuration first, then click renew all to renew the IP information again.
For Windows NT4.0/2000/XP, run ipconfig.exe in DOS mode. (ipconfig.exe/?