The ipeng command permits the manipulation of low level IP parameters. Only use this command under instruction from your support provider.
To reset all parameters to their default values, use the following command:
ipeng -d
Some of the parameters can be set on a per-interface basis, the rest are global settings.
To create a specific configuration for an interface, use the following command:
ipeng -x create -g <interface>
An interface-specific configuration must be created before specific values can be set for that interface. The interface-specific configuration can be created prior to creating the interface.
To delete an interface-specific configuration, use the following command:
ipeng -x delete -g <interface>
The ipeng command has the following default settings:
| Parameter | Default value | Command |
| Def wnd (bytes) | 64240 | ipeng -w 64240 |
| Delayed acks | On | ipeng -y on |
| Slow start ca | On | ipeng -s off |
| SS restart double mss | On | ipeng -r on |
| Nagle | Off | ipeng -n off |
| Silly window avoid | On | ipeng -a on |
| Slow start on idle | On | ipeng -i on |
| Fast retx fast recovery | On | ipeng -f on |
| Intelliseg | Off | ipeng -l on |
| Loose Karn enable | On | ipeng -k on |
| Strict TIME_WAIT enable | Off | ipeng -T on |
| Quick R1 teardown | Off | ipeng -q off |
| Minimum RTO | 300 | ipeng -o 300 |
| Maximum RTO | 64000 | ipeng -O 64000 |
| SACK enable | On | ipeng -S on |
| PAWS enable | On | ipeng -P on |
| TCP Window Scaling enable | On | ipeng -W on |
| TCP Window Scale factor | 2 | ipeng -F 2 |
| TCP Window Scale size | 262143 | For information only |
| TCP Rate Control | On | ipeng -R on |
The following sections provide additional information on the most important
ipeng settings.