Netstat column graph, retrans
list Sigurður Guðbrandsson
Hi. I am wondering about the netstat column's graph, specifically the retrans. The things I am wondering about are, what does this stand for (e.g. is it the retransmission timeout of packets or amount of packets retransmitted)? Also, what is a high value for this? The reason I ask of this is because I have not found any solid answers using either google or searching the mailing list. With regards, Sigurður Guðbrandsson
list Greg L Hubbard
It probably refers to the number of packets that had to be retransmitted regardless of reason. A low number is not a problem ("stuff" happens), but a high number can indicate a problem somewhere in a network. The host reporting the retransmissions could be part of the problem (misconfigured link, perhaps) or it could be a "vicitm" of problems elsewhere -- congestion, duplex mismatches, dirty circuits, etc.
GLH
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From: Sigurður Guðbrandsson [mailto:user-f6f2e0690a1f@xymon.invalid]
Sent: Tuesday, September 09, 2008 12:33 PM
To: user-ae9b8668bcde@xymon.invalid
Subject: [hobbit] Netstat column graph, retrans
Hi.
I am wondering about the netstat column's graph, specifically the retrans.
The things I am wondering about are, what does this stand for (e.g. is it the retransmission timeout of packets or amount of packets retransmitted)?
Also, what is a high value for this?
The reason I ask of this is because I have not found any solid answers using either google or searching the mailing list.
With regards,
Sigurður Guðbrandsson
list Anna Jonna Armannsdottir
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On þri, 2008-09-09 at 17:32 +0000, Sigurður Guðbrandsson wrote:
The things I am wondering about are, what does this stand for (e.g. is it the retransmission timeout of packets or amount of packets retransmitted)?
Hi Sigurður, please have a look at e.g. : http://www.hswn.dk/hobbit-cgi/bb-hostsvc.sh?CLIENT=voodoo.hswn.dk In the [netstat] section is a TcpExt section. It contains a number of retransmission counts and I guess it is the sum of those counts that is graphed. The important thing is that it is packet counts that is graphed. -- Kindest Regards, Anna Jonna Ármannsdóttir, %& A: Because people read from top to bottom. Unix System Aministration, Computing Services, %& Q: Why is top posting bad? University of Iceland.
list Henrik Størner
In <user-4f9a30ea570f@xymon.invalid> =?iso-8859-1?Q?Sigur=F0ur_Gu=F0brandsson?= <user-f6f2e0690a1f@xymon.invalid> writes:
I am wondering about the netstat column's graph, specifically the = retrans.
These data usually come from the operating system "netstat -s" command, so you should check the OS docs to see what those are. It is normally the number of packets retransmitted over a 5 minute average (so it should be *really* low unless you have network problems). Henrik