Re: different networks, same computer (map mapping ?)
--- John Schmidt <jaschmidt@uofu.net> wrote:
> Specifically, choose the interfaces file so that
> eth0 is configured at
> dhcp . . . Do you alter the above interfaces file
> when you are at home using
> dhcp?
Yes, 'etho0 is configures at dhcp client' means I am able to boot with a
different interfaces file which just configures eth0 to look for dhcp
server.
> How long have you waited while the MTA:Exim
> hangs? Before I had
It is not Exim that hangs, but the boot process hangs just after this
step. I guess it is at the step where "uessnet starting network
interface plugin" or something like this.
> Not sure why your setup is not working, but I would
> try and do these steps:
> 1. Test if iplugd is working correctly, i.e. you
> plug your cable in, and your
> network comes up, and if you remove it network is
> unconfigured.
> a. Revert back to your original interfaces
> file, and remove guessnet.
> b. Reboot the machine with the cable installed.
> c. Remove cable and look at /var/log/syslog and
> see if you see activity.
> I use tail -f /var/log/syslog to do this. If you
> get something like:
>
> Nov 2 12:09:10 puppy ifplugd(eth0)[3460]: Link beat
> lost.
> Nov 2 12:09:10 puppy kernel: eth0: link down
>
> And also look at your routing table, i.e. sudo
> route.
>
> You shouldn't have anything there. Then, plug your
> cable back in and you
> should see:
>
> Nov 2 12:12:04 puppy kernel: eth0: link up,
> 100Mbps, full-duplex, lpa 0xC1E1
> Nov 2 12:12:04 puppy ifplugd(eth0)[3460]: Link beat
> detected.
> Nov 2 12:12:05 puppy ifplugd(eth0)[3460]: Executing
>
> '/etc/ifplugd/ifplugd.action eth0 up'.
>
> And your routing table should have been set back up.
I did as you suggested. I unisntalled guessnet and tested ifplugd, it
was working properly. The computer booted even without a cable plugged
in. But, the dhcp request was being sent by eth0 *before* ifplugd was
doing it's job so without the cable this meant a wait of around a minute
or so while eth0 waited and failed to get a dhcp offer.
However, I did notice that after installing arping, I didn't receive any
packats from my LAN dhcp server:
$>arping -i eth0 192.168.0.2
I could get back packats only if I make the request with -p, making eth0
as promiscuous device.
Next step, after satisfying myself that ifplugd was working as expect, I
re-installed guessnet, and just had one network situation 'home' where
eth0 was supposed to be configured as dhcp client. The boot process
still hangs at the same place. I am suspecting:
1) either I need to somehow tell guessnet to make eth0 promiscuous while
sending out arping requests
2) guessnet has bugs(?)
Also, in the interfaces file, am I supposed to use "test-peer" or "test
peer"? Man page of guessnet suggests the latter. I tried both with same
results. Here is what I had in my interfaces file:
#----------------------------------------------
# The loopback network interface
auto lo
iface lo inet loopback
#mapping
mapping eth0
script /usr/sbin/guessnet-ifupdown
map default: none
map timeout: 3
map verbose: true
#home network
iface home inet dhcp
test peer address 192.168.0.2 source 192.168.0.15
#----------------------------------------------
everything else was commented out.
->HS
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