SnapGear 2.0.1 - Manual (Page 55)

Network Connections
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Change MAC address
On rare occasions it may be necessary to change the Ethernet hardware or MAC
Address of your CyberGuard SG appliance. The MAC address is a globally unique
address and is specific to a single CyberGuard SG appliance. It is set by the
manufacturer and should not normally be changed. However, you may need to change it
if your ISP has configured your ADSL or cable modem to only communicate with a device
with a known MAC address. On SG570 and SG575, you may also change the MAC
address of the DMZ port.
QoS Traffic Shaping
Traffic shaping provides a level of control over the relative performance of various types
of IP traffic. The traffic shaping feature of your CyberGuard SG appliance allows you to
allocate High, Medium, or Low priority to the following services: domain (tcp), domain
(udp), ftp, ftp-data, http, https, imap, irc, nntp, ntp, pop3, smtp, ssh, and telnet.
This advanced feature is provided for expert users to fine tune their networks. The Auto
Traffic Shaper uses a set of inbuilt traffic shaping rules to attempt to ensure low latency
on interactive connections, while maintaining fast throughput on bulk transfers. The
Upstream and Downstream Speed should. If you have a PPTP or PPPoE connection
to the Internet, enter approximately 80 – 90% of the speed that the ISP supplied to
account for protocol overheads.