The MTU must match the MTU of your serial line device, otherwise, eql_enslave just fails when it is called. You have also to turn off Van-Jacobson compression on your slave devices.
Once the eql device is configured, it will stay up and running until you shut it down manually or reboot. If you have the eql support compiled as a module then all you have to do is to remove the module after downing the interface.
Note that you have to connect to a terminal server capable of doing load balancing or another Linux box to use EQL.
ifconfig eql 192.168.1.2 netmask 255.255.255.0 mtu 1500
eql_enslave eql ppp0 33600
eql_enslave eql ppp1 14400
eql_enslave eql ppp2 28800
Manual page added by Roberto Lumbreras <email@example.com>.