> -----Original Message-----
> From: Tim Fletcher [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, June 09, 1999 1:58 PM
> To: Irina Kotlova
> Cc: linux-net
> Subject: Re: RedHat network
>
> > I'm new person to Linux.
> > I've installed RedHat 2.2-15. I've configured network with NE2000 at
> > io=0x320. It worked OK previously at another machine.
> > While network interface looks as bellow:
> >
> > eth0 Link encap:Ethernet HWaddr 00:40:95:00:00:10
> > inet addr:192.168.2.1 Bcast:192.168.2.15 Mask:255.255.255.0
> > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> > RX packets:17 errors:0 dropped:0 overruns:0 frame:0
> > TX packets:7 errors:7 dropped:0 overruns:0 carrier:0
> > collisions:7 txqueuelen:100
> > Interrupt:5 Base address:0x320
>
[Luijpen, Alexander van] The mask is a bit inconsistent with the
bcast address. For a mask like the alias device eth0:0 on the other machine
(255.255.255.240), this seems a normal broadcast address. This would put
both this machine (.2.1) and the other machine (.2.8) in the same address
range. His mask of .240 (28 bit instead of 24bit in .255) limits the number
of machines in his range to 14 (not counting .0 and .15)
(255= $ff, 0 = $00)
(240= $f0, 15 = $0f)
Changing this mask from .255 to .240 should work (provided routing
is setup correctly) This kind of subnetting is correct, but not often used I
guess, since the most people are used to working with mask with multiples of
8bits.
> I would raise a few questions about that inferface:
> 1. You have an none routable ip.
> 2. That broadcast looks odd, I may be wrong on that but a "normal" single
> subnet broadcast would be: 192.168.2.255 which is what you mask would
> indicate.
>
> > , I have 7% packet loss during "ping" to the neighbour host in the same
> > local network. The opposite "ping" from the neighbour host to mine fails
> > completely with 100% loss. Its parameters:
>
> <lo snipped>
>
> > eth0 Link encap:10Mbps Ethernet HWaddr 00:40:95:80:01:E3
> > inet addr:194.247.138.97 Bcast:194.247.138.111
> Mask:255.255.255.240
> > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> > RX packets:187471 errors:0 dropped:0 overruns:0
> > TX packets:188970 errors:23 dropped:0 overruns:0
> > Interrupt:10 Base address:0x320
> >
> > eth0:0 Link encap:10Mbps Ethernet HWaddr 00:40:95:80:01:E3
> > inet addr:192.168.2.8 Bcast:192.168.2.15
> Mask:255.255.255.240
> > UP BROADCAST RUNNING MTU:1500 Metric:1
> > RX packets:0 errors:0 dropped:0 overruns:0
> > TX packets:0 errors:0 dropped:0 overruns:0
>
> How are you connected to this neighbour? (I assume that you are connected
> to the same hub as the uplink to the outside world and the alias is on the
> same interface. have you checked the routing on the other machine and made
> sure that packets aliased inferface are sent back ov er the aliased
> interface? I also note that the mask is different on the 2 different
> machines. I also see that the same broadcast is on the neighbour is there
> a reason for this I am missing?
>
[Luijpen, Alexander van] Apparently, for the eth0 device, it is on
a subnet in the range of 194.247.138.96 to 194.247.138.111.. (in hex: .$60
to .$6f). Maybe this machine is on somekind of network where there are up to
14 machines on a single location (class room ? floor ? street ?), so
different locations are officially on different subnets. This would mean
that the master gateway must have a lot of devices or aliases (one for each
location). My guess is there is something wrong in routing.
> --
>
> Tim Fletcher .~.
> /V\ L I N U X
> [EMAIL PROTECTED] // \ >Don't fear the penguin<
> [EMAIL PROTECTED] /( )\
> ^^-^^
>
> The most exciting phrase to hear in science, the one that heralds new
> discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
> -- Isaac Asimov
>
>
>
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