halcyone
asked on
Segment Retransmitted
Hello There.
When doing a netstat-s
How many segment retransmitted is too many - is it 4 percent of segments sent?
What is the best way to trace these retransmissions - using a smiffer ? How easy is this to do?
Thanks
When doing a netstat-s
How many segment retransmitted is too many - is it 4 percent of segments sent?
What is the best way to trace these retransmissions - using a smiffer ? How easy is this to do?
Thanks
If it's a LAN is bad, it must be around 0. If it's in Internet it's good, can be between 5 and 30 percent. The retransmission of a segment is done when your computer (the sender) does'n't receive the acq signal in time. You can use netdiag for a more comprehensive diagnostic of your network.
ASKER
PC's communicating between WANS have the following stats after being rebooted on Friday and not connecting to the internet - what the easiest way to find out the cause?
Tuesday Morning:
192.168.74.5 13214014 sent 70780 retrans 0.5%
192.168.74.6 13393823 sent 327973 retrans 2.4%
192.168.74.8 9872540 sent 43062 retrans 0.4%
192.168.74.14 12113122 sent 81588 retrans 0.7%
192.168.74.28 3144063 sent 42137 retrans 2.4%
Thursday Morning:
192.168.74.5 23047639 sent 178366 retrans 0.8%
192.168.74.6 20335236 sent 759408 retrans 3.7%
192.168.74.8 16368667sent 97540 retrans 0.6%
192.168.74.14 19401001sent 181531retrans 0.9%
192.168.74.28 9432007 sent 113058 retrans 1.1%
192.168.74.6 28879828 sent 828394 retrans 2.8%
thanks
ASKER
Is it possible that some router settings like using cisco WFQ methods instead of FIFO could cause this ?
Thanks
Thanks
As you can see there are two computers that requires retransmission, the one with over 1% retries. There are a lot of tests that can be done, but the best one is using a quality metter. You can try diagnosing by changing port in switch, replacing cables. If the two computers are not the same as others (less powerful processor, less memory, another O/S) or if they are loaded with software which use a lot of processor time, this can be an answer.
Cisco WFQ e slower than FIFO, because is a protection against burst flow. Can be.
ASKER
Thanks guys,
-what is a quality meter? And how is it used to test for retransmissions ?
- what ways are there of tracking the cause of retransmission exactly.
thanks
-what is a quality meter? And how is it used to test for retransmissions ?
- what ways are there of tracking the cause of retransmission exactly.
thanks
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ASKER
thanks for your input