Link Control
available in GNS3 version 2.1 and later.
Packet Filters
Packet filters can be applied on links without stopping any node.
Supported packet filters are:
- Frequency_drop drop a packet every x packets.
- Packet_loss randomly drop a packet
- Delay: adds latency and/or jitter.
- Packet_corruption randomly corrupt a packet.
- BPF_(Berkeley_Packet_Filter) filter packets matching a BPF expression.
All packet filters can be combined, meaning you can apply both a packet loss filter and a delay filter on the same link that will be active simultaneously.
To apply a packet filter, right-click on a link, and select Packet filters:
As an example, click the Delay tab, add a non-zero value for Latency, then click Apply:
The icon on the Delay tab changes from a red square to a green circle, indicating it’s active:
Click OK to close the Packet filters window:
A filter icon will be displayed on the link to indicate one or more packet filters are active.
Suspend a Link
It is possible to suspend a link. For instance, to simulate a temporary connectivity issue in your project. Suspending a link currently means that all packets going through the link will be dropped.
To suspend a link, right-click it and then select Suspend:
The link is now suspended, so no traffic can pass through it:
