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lltping -s [-q|-v] [-p port] [-T] [-K] [-m size]
Additionally, lltping can be used to report round-trip-time (RTT) between the client and server.
- -c node_id
- Specify client mode and connect to remote server running on LLT node node_id.
- Specify server mode.
- -p dport
- Specify the LLT port to use in transmitting and receiving packets. The default is LLT port 30.
- Report round-trip-time (RTT).
- -n count
- Send count packets and report RTT for each. By default 20 packets are sent when reporting RTT.
- Report summarized RTT values only. By default RTT for each packet sent is reported followed by a summary of average, maximum, minimum RTT.
- Verify checksum of each packet received. By default lltping does not verify any packet received (except for the length). With this option the receiver verifies the checksum calculated by the sender to catch any data corruption.
- -m size
- Specify the message size to be sent and expected to be received. Default size is 128 bytes. Maximum size that can be specified is 16K.
- Specify quiet operation.
- Specify verbose operation.
Network connectivity checksystem1# lltping -s & system1#
RTT reportingsystem2# lltping -c 0 Node 0 is alive Node State Link Status Address 0 system1 OPEN qfe0 UP 00:30:6E:06:81:7B qfe1 UP 00:30:6E:06:51:CA system2#system1# lltping -s -T & system1#
system2# lltping -c 0 -T lltping: send_recv_ping to node=1, pkts=3 lltping: pkt=0, rtt=(0s 161382us)tx=(0s 157us) rx=(0s 161225us) lltping: pkt=1, rtt=(0s 285us)tx=(0s 131us) rx=(0s 154us) lltping: pkt=2, rtt=(0s 287us)tx=(0s 133us) rx=(0s 154us) lltping: pkts=3, msgsz=128, rtt:min/avg/max=285/53984/161382 usec system2#
The RTT reported is between lltping instances running in user-space on two nodes. Hence the RTT numbers obtained are not indicative of RTT observed by kernel clients (which are the real ones) of LLT. Also timings of first few packets is not taken into account while reporting average RTT. This is because RTT of initial packets include connection setup delays which are a one time phenomenon and should not be part of the average.
Last updated: March 2006
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