You may have had <a href="http://ap1.foo.com">ap1.foo.com</a> and <a href="http://ap2.foobar.com">ap2.foobar.com</a> (two different domain, one of which is not registered).<br><br><div><span class="gmail_quote">On 11/5/07,
<b class="gmail_sendername">Dennis Ortsen</b> <<a href="mailto:firstname.lastname@example.org">email@example.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
The testping tag solved my problem.<br><br>Strange however that with that large number of access points I didn't have<br>the same issue. Perhaps it's just the additional number of IP-addresses that<br>are not resolvable that made this visible?
<br><br>Anyway, I now get the correct results, thanks guys.<br><br>Br.<br><br>Dennis<br><br>> -----Oorspronkelijk bericht-----<br>> Van: Henrik Stoerner [mailto:<a href="mailto:firstname.lastname@example.org">email@example.com</a>]<br>
> Verzonden: vrijdag 2 november 2007 18:07<br>> Aan: <a href="mailto:firstname.lastname@example.org">email@example.com</a><br>> Onderwerp: Re: [hobbit] strange result in fping by hobbit and<br>> fping by yourstruly<br>><br>> On Fri, Nov 02, 2007 at 01:46:44PM +0100, Dennis Ortsen wrote:
<br>> > I only do a conn test on an ip-address. I use the full path<br>> to fping<br>> > in hobbitserver.cfg, without any extra parameters. When<br>> hobbit starts<br>> > testing the connection, only 14 terminals respond to a
<br>> ping, but when<br>> > I execute a fping myself (as the hobbit user) in a shell to<br>> the same<br>> > amount of terminals, I get a totally different result,<br>> instead of 14<br>> > responding terminals, I get 95 responding terminals with
<br>> fping! It's<br>> > not just a lucky shot, I can keep on trying these<br>> terminals, the huge<br>> > difference remains whether I fping them myself or when<br>> hobbit fpings them.<br>> >
<br>> > I'm running hobbit 4.2.0. According to bbtest I have 806 hosts that<br>> > are pinged, that takes about 26 seconds to complete. To<br>> complete all<br>> > tests (954), it takes about 47 seconds.
<br>> ><br>> > Does anyone have a clue why specifically these terminals<br>> have such a<br>> > difference in hobbit ping and a ping performed by myself?<br>><br>> What error does the failed ping tests show - DNS error, or
<br>> just ping failure ? If it's DNS errors, use the "testip" tag<br>> to avoid doing DNS lookups - I understand from the other<br>> mails in the thread that these systems are not in the DNS.<br>>
<br>> I suspect it might be an issue with the number of tests<br>> running simultaneously. ICMP packets have lower priority in<br>> most network equipment, and is therefore the first packets to<br>> be discarded when there is a lot of traffic on the network.
<br>> Since you're referring to "terminals" they might not have a<br>> lot of memory for network buffers and therefore they might<br>> drop packets more often than "real" computers.<br>>
<br>> There is also a possibility that the number of hosts tested<br>> is overflowing the ARP cache table on the Hobbit server,<br>> which can lead to packets being lost.<br>><br>> I'd suggest starting with some extra options for bbtest-net (in
<br>> hobbitlaunch.cfg): Add --concurrency=32 to the bbtest-net<br>> command, and change the FPING setting in hobbitserver.cfg to<br>> FPING="fping -i150", this will increase the time fping waits<br>> between sending packets from 25 ms to 150 ms, so there is
<br>> less ICMP traffic on the network.<br>><br>> You can replicate how Hobbit performs the ping test by<br>> putting the IP's of all your hosts into a text file (one IP<br>> per line), then run<br>> fping -Ae </tmp/IPlist.txt
<br>><br>><br>> Regards,<br>> Henrik<br>><br>><br>> To unsubscribe from the hobbit list, send an e-mail to<br>> <a href="mailto:firstname.lastname@example.org">email@example.com</a><br>><br>
><br><br><br>To unsubscribe from the hobbit list, send an e-mail to<br><a href="mailto:firstname.lastname@example.org">email@example.com</a><br><br><br></blockquote></div><br><br clear="all"><br>-- <br>Josh Luthman
<br>Office: 937-552-2340<br>Direct: 937-552-2343<br>1100 Wayne St<br>Suite 1337<br>Troy, OH 45373<br><br>Those who don't understand UNIX are condemned to reinvent it, poorly.<br>--- Henry Spencer