Vlans - Secure Computing SG300 User Manual

If you have multiple bridges on your network, you may want to Enable Spanning Tree
Protocol. It allows the bridges to exchange information, helping elimate loops and find
the optimal path for network traffic.
Forwarding Delay is the time in seconds between when the bridge interface comes
online and when it begins forwarding packets. This usually only occurs when the unit first
boots, or the bridge configuration is modified. This delay allows the SnapGear unit's
bridge to begin learning which hosts are connected to each of the bridge's interfaces,
rather than blindly sending network traffic out all network interfaces.
Click Next to review or change IP address information for the bridge interface, otherwise
click Finish.
Bridging across a VPN connection
Bridging across a VPN connection is useful for:
Sending IPX/SPX over a VPN, something that is not supported by other VPN
vendors
Serving DHCP addresses to remote sites to ensure that they are under better
control
It allows users to make use of protocols that do not work well in a WAN
environment (e.g. netbios)
A guide to bridging across an IPSec tunnel using GRE is provided in the section entitled
GRE over IPSec in the Virtual Private Networking chapter.

VLANs

Note
VLANs are not supported by the SG300.
VLAN stands for virtual local area network. It is a method of creating multiple virtual
network interfaces using a single physical network interface.
Packets in a VLAN are simply Ethernet packets that have an extra 4 bytes immediately
after the Ethernet header. The format for these bytes is defined by the standard IEEE
802.1Q. Essentially, they provide for a VLAN ID and a priority. The VLAN ID is used to
distinguish each VLAN. A packet containing a VLAN header is called a tagged packet.
Network Setup
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