Modify Settings of Static Tunnels
If you want to change the settings of a static tunnel after
you have created it, you can modify its features and options. For example,
you may want to disable compression for a particular tunnel.
Note: You cannot turn on compression, acceleration,
packing, or discovery for a tunnel if the feature is disabled globally.
To modify tunnel settings:
1. Click the xpress tab.
2. In the Tunnel Name column, click the name of the
static tunnel you want to edit. The Edit Tunnel window appears.
 show screen
3. For each feature, select off or use global:
|
Feature
|
Description
|
|
Acceleration
|
Disable acceleration for the tunnel or use the global setting
for acceleration
Note: The FastStart, Prefetch, and SCPS features cannot
be enabled/disabled on a per-tunnel basis, so they are not available
in the Edit Tunnel window. Another option that is not available
here is SkyX compatible; tunnels cannot be designated SkyX
compatible after they are created.
|
|
Compression
|
Disable compression for the tunnel or use the global setting
for compression
|
| Packing |
Disable packet packing for the tunnel
or use the global setting for packing |
4. For each option, select the desired setting:
|
Option
|
Description
|
|
Firewall
|
Enable or disable firewall support for the tunnel or use the
global setting. If the PacketShaper will be sending and receiving
tunneled traffic through a firewall tunnel (a pair of stateful firewalls), this setting must be enabled.
It is not necessary to enable firewall support on each tunnel
partner. When firewall support is enabled on one end of the tunnel,
it will automatically act as if it is enabled on any partners
(although the firewall setting is not actually physically changed
on these partners).
It is not recommended to enable firewall support on tunnels used just for acceleration.
|
|
DiffServ
|
Enable or disable DiffServ (Differentiated Services) mode for
the tunnel or use the global setting. DiffServ mode should be
enabled when using compression or packing on
a DiffServ network.
If an Xpress tunnel has DiffServ enabled, Xpress will inspect
all packets for its DiffServ Code Point (DSCP) value. Within the
tunnel, it will create a separate lane for each DSCP value.
When Xpress sees packets with a DSCP different from those seen
before, it will create a new lane associated with that DSCP. Any
packets with that DSCP are then sent through the associated lane.
Notes:
- When DiffServ mode is enabled, the tunneled super packets
will inherit the DiffServ markings of the original packets.
- If a super packet is marked with a different DSCP value while
it's inside the MPLS network, the partner PacketShaper at the
other end of the tunnel will remark each of the original packets
with this new value.
- Xpress supports up to five DSCP values.
If your network exceeds the maximum, the super packets in the
tunnel will not have DiffServ markings. However, if the super
packet is marked with a different DSCP value while it's inside
the MPLS network, the partner PacketShaper will remark each of
the original packets with the new value.
- Not applicable to acceleration tunnels
|
| Discovery |
Disable the auto-discovery of hosts
for the tunnel or use the global setting. When host discovery is disabled,
you will need to manually add hosts to the tunnel using the tunnel local add and tunnel remote add commands.
Note: Automatic host discovery works in enhanced mode only; it is not operable in migration mode.
|
| MTU |
Set the Maximum Transmission Unit (MTU) used for packing and acceleration
on the tunnel, or use the global setting. The MTU defines the maximum
size of the super packet — it's the largest datagram than can
be transmitted by an IP interface (without it needing to be broken
down into smaller units). Valid MTU values are 100-1500; the default
is 1500 bytes.
|
5. Click OK. In the Xpress Tunnels Overview,
the tunnel name is now italicized, indicating that the tunnel has customized
settings that are different from the global defaults.
See also:
Create a Static Tunnel
Xpress Overview
|
