Messages in this thread |  | | From | David Lang <> | Date | Sun, 19 Aug 2001 18:03:15 -0700 (PDT) | Subject | Re: Aliases |
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where can I get the iproute package mentioned below. I just double checked slackware 8.0 and it isn't included.
David Lang
On Sat, 18 Aug 2001, Ralf Baechle wrote:
> Date: Sat, 18 Aug 2001 14:32:32 +0200 > From: Ralf Baechle <ralf@uni-koblenz.de> > To: Justin Guyett <justin@soze.net> > Cc: Jim Roland <jroland@roland.net>, linux-kernel@vger.kernel.org > Subject: Re: Aliases > > On Sat, Aug 18, 2001 at 03:30:59AM -0700, Justin Guyett wrote: > > > > Having recently gone from 2.2 to 2.4 what's the device convention now? I > > > thought it was eth0 (example) and eth0:0 .. eth0:255, but knew kernel 2.4 > > > would take it further. > > > > presuming this isn't an ifconfig limit instead of a kernel limit, trying > > "ifconfig eth0:x" works for x < 10000, anything > 10000 and x becomes > > x%10000. > > For various reasons interfaces aliases are deprecated. The recommended > way of doing things these days is just adding more addresses to an > interface with the ip(8) program from the iproute package. It works like: > > ip addr add 192.168.2.0/24 broadcast 192.168.2.255 scope host dev eth0 > > > However, 2.4 also has multiple addresses of the same type per device; > > unfortunately it's fairly slow. Adding or deleting addresses seems to > > take ~5 seconds per 255 addresses on my machine, and listing addresses > > takes about 1 second / 300 addresses on the same machine. > > It seems you've tried to add individual addresses, one by one. That's not > necessary, you can add the addresses of a whole subnet to the kernel. If > you have a large network that's dramatically faster and easier to > administrate. > > > Also, listing addresses for another interface isn't any faster, which is > > unfortunate; ip shouldn't need to check addresses of all interfaces just > > to get the ones for the requested interface. > > > > At least listing time seems to increase linearly with the number of > > addresses. IIRC someone posted a patch a few weeks ago to speed this up > > (no longer sits for a long time before listing addresses). > > > > time ip addr show dev eth1 | wc -l > > 37766 > > ip addr show dev eth1 113.17s user 1.82s system 99% cpu 1:55.38 total > > That's crude abuse unless your IPs are actually non-contiguous in address > space - which they're almost certainly not. > > > Also, ifconfig, which has no idea about any but the first address in an > > address class, also does nothing for the same amount of time before > > listing interfaces. > > ifconfig is deprecated as it permits you only access to a small part of > power of the current Linux networking; ip is the recommended replacement. > > > Anyway, it seems ip and the 2.4 scheme with multiple addresses per > > interface can handle many more addresses than ifconfig and the device > > alias scheme. > > Try ``ip addr add 10.0.0.0/8 broadcast 10.255.255.255 scope host dev eth0'' > with interface aliases :-) > > Ralf > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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