Re: bandwidth limiting on virtual hosts

[Danny Sauer <sauer@cloudmaster.com>]

I can't say how well it works from an admin standpoint - though this is
a project I'm working on for the next couple of weeks (apperently it's
nice for web developers to be able to test sites at speeds less than
100Mbps).  From a user standpoint, though, my ISP provides wireless
service with different levels of bandwidth, and the bandwidth is shaped
using the tc stuff.  I think he's using the cbq thing now.  It works
pretty well - when I was at a less-than-full-bandwidth rate it would
choke the speed down without introducing any latency that wasn't in
line with the lower transfer rate.  I use ssh a lot, and the latency
doesn't appear to be affected much through the connect.

Anyway, I'm building the tools next week on our router (which needs
rebuilt anyway due to some incompetent sysadmin forgetting to update
openSSH on the machine and subsequently getting halfway-hacked by an
even more incompetent script kiddie).  I'll let you know if the obtuse
system drives me completely insane or not. :)

BTW, the "linux 2.4 advanced routing" how-to is fairly helpful, too,
though selecting a queueing algorithm seems to require more of a CS
degree than it should...  Sigh.

--Danny, who might understand better after he takes the history class
and art appreciation course that are keeping him from his CS degree
</rant>

On Thu, May 23, 2002 at 01:28:47PM -0500, Charles Menzes wrote:
> 
> so i found out :(
> 
> there is actually a fairly decent howto on the subject at
> 
> http://www.ibiblio.org/pub/Linux/docs/HOWTO/other-formats/html_single/Bandwidth-Limiting-HOWTO.html#AEN60
> 
> i think it tries to cover a little too much, but i think there is a good 
> deal of info worth getting out of the article.
> 
> i guess it depends on where you are concerned about your bottleneck may 
> occur, but i found it was easier to limit via the router rather than the 
> os. i'd still be very interested in learning more about how this works :)
> 
> charles
> 
> On Thu, 23 May 2002, Danny Sauer wrote:
> 
> > On Fri, May 17, 2002 at 10:16:34AM -0500, Charles Menzes wrote:
> > > i just read through the article in this month's sysadmin about bandwidth 
> > > limiting using a couple of commercial products as well as iptables. does 
> > > anyone have a good resource for iptables example configs for bandwidth 
> > > control?
> > 
> > You can't do bandwidth shaping with iptables alone, you need the tc tools
> > to do that.  The packets are (can be) tagged with iptables, then the tc
> > stuff assigns them to queues for the bandwidth management.  It's a pain
> > to set up initially.  I've been told to look into cbq at
> > ftp://ftp.equinox.gu.net/pub/linux/cbq/ but I've not done that yet.  It
> > looks decent, though.
> > 
> > --Danny, who thinks that iptables should have some way to limit bandwidth anyway :)
> > 
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> 
> 
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