[CentOS] Weird bandwith behaviour (download throughput) on CentOS based gateway
Jobst Schmalenbach
jobst at barrett.com.au
Tue Oct 10 01:57:56 UTC 2017
On Mon, Oct 09, 2017 at 03:05:51PM +0200, hw (hw at adminart.net) wrote:
> Jobst Schmalenbach <jobst at barrett.com.au> writes:
>
> > On Thu, Oct 05, 2017 at 02:57:18PM +1300, Clint Dilks (clintd at scms.waikato.ac.nz) wrote:
> >> On Thu, Oct 5, 2017 at 2:41 PM, Jobst Schmalenbach <jobst at barrett.com.au>
>
> Is there a dependency on which machine you test first? Perhaps the file
> has been stored in some cache along the way and for the second test, it
> can be delivered from the cache instead of from the source, which might
> yield higher speeds.
Very good question, answer is no for the following reasons:
- it happens for all downloads - yum, wget etc
- I have looked at the interfaces using ngrep, all traffic goes straight out through the closest (as in hops) interface
- As you raised this I have disabled caching on the command line using wget, still happens
- As you raised this I have checked whether there are any (environment) options set, none
I, too, use the same bash scripts on all machines I have
I though about the interfaces, but can't be. The last two interfaces are on the problem machine, but when downloading on the LAN I get a throughput of ~28mbs, only when downloading on the gateway I only get <10mbs.
So still baffled.
Jobst
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