Re: Continuing internet oddities
On Thu, Nov 09, 2006 at 12:48:24PM -0600, cothrige wrote:
> * H.S. (hs.samix@gmail.com) wrote:
> ...
> worked fine, but lately the connection is uber-flaky. It doesn't
> always come up at boot, and even when it does it is dropping out
> badly. When this happens I will experience something like five
> minutes at a time without any ability to access anything online at
> all. Very irritating, and since it is intermittent I am not sure
> where to look.
>
> > When you expect a connection to have been established, what is the
> > output of these commands:
> >
> > $> route -n
> > $> ifconfig -a
> > $> cat /etc/resolv.conf
>
> BTW, I had to run this as root, even though it appears you were
> expecting a user account to work, but I could not get it to that way.
You probably don't have /sbin/ in your path, but can run them as
/sbin/route, /sbin/ifconfig. I'm too lazy to change my default path,
so haven't gotten used to doing this.
> But, in any case, here is what I get:
>
> For 'route -n':
> Kernel IP routing table
> Destination Gateway Genmask Flags Metric Ref Use Iface
> 192.168.15.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
> 0.0.0.0 192.168.15.1 0.0.0.0 UG 0 0 0 eth0
>
> For 'ifconfig -a':
> eth0 Link encap:Ethernet HWaddr 00:0B:6A:23:86:A3
> inet addr:192.168.15.100 Bcast:192.168.15.255
> Mask:255.255.255.0
> inet6 addr: fe80::20b:6aff:fe23:86a3/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>...
>
> Hopefully something above can help pinpoint what I have that is not
> working quite right.
I'll try this one more time, having struck out in several other
threads. :-) I've had wierd problems on my PPPoE DSL connection (and
other times using PPP) if the MTU is too large, and this has cropped up
apparently due to upstream changes in the ISP's systems. Small packets
(e.g., ping) have no problem, but some protocols with larger packet
sizes get fouled up when a too-large packet has to squeeze through a more
restrictive network segment. The end result is long timeouts or seemingly
"hung" connections sometimes, but not always. As always, just a WAG.
As someone showed in another thread, I've used a line in the interfaces
file (in /etc/network/) to set this value.
Good luck!
Ken
--
Ken Irving, fnkci@uaf.edu
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