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cmd:lotest [2011/10/26 15:15] mcb30 |
cmd:lotest [2013/04/03 15:28] mcb30 |
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| Perform a loopback test by sending packets from one network interface and verifying that they are received correctly on a second network interface. The two network interfaces should be directly connected using a network cable. | Perform a loopback test by sending packets from one network interface and verifying that they are received correctly on a second network interface. The two network interfaces should be directly connected using a network cable. | ||
| - | You can specify the packet size (excluding the link-layer header) using the ''--mtu'' option. If no packet size is specified, then the default Ethernet size of 1500 bytes will be used. | + | You can specify the packet size (excluding the link-layer header) using the ''%%--mtu%%'' option. If no packet size is specified, then the default Ethernet size of 1500 bytes will be used. |
| The test will continue until it is interrupted (e.g. by pressing ''Ctrl-C'') or until a packet is received incorrectly. The number of packets successfully received will be displayed as a running total during the test. | The test will continue until it is interrupted (e.g. by pressing ''Ctrl-C'') or until a packet is received incorrectly. The number of packets successfully received will be displayed as a running total during the test. | ||
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| Some drivers that pass a loopback test may use an MTU that is too small to support VLANs. These can be identified by creating a VLAN interface on each end, and then performing the loopback test over the VLAN interfaces. For example: | Some drivers that pass a loopback test may use an MTU that is too small to support VLANs. These can be identified by creating a VLAN interface on each end, and then performing the loopback test over the VLAN interfaces. For example: | ||
| - | vcreate --id 123 net0 | + | vcreate --tag 123 net0 |
| - | vcreate --id 123 net1 | + | vcreate --tag 123 net1 |
| lotest net0-123 net1-123 | lotest net0-123 net1-123 | ||
