[Linux-ia64] simeth problem...

[Linux-ia64] simeth problem...

[Peter Chubb]

Hi,
	I'm having problems with the simulated ethernet interface.

From within the simulator, I can ping any machine on the local network
except the machine the simulator is being hosted on.

I can ping the simulated ethernet from any machine on the network
except the one the simulator is hosted on.

I'm using kernel 2.4.18 in each case.

Does anyone have any ideas?

The simulator is running on the machine with address 192.168.77.9

sh-2.05a# ifconfig
Warning: cannot open /proc/net/dev (No such file or directory). Limited output.
eth0      Link encap:Ethernet  HWaddr 00:A0:CC:60:B4:87  
          inet addr:192.168.77.13  Bcast:192.168.77.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:49 

sh-2.05a# ping 192.168.77.9
PING 192.168.77.9 (192.168.77.9): 56 data bytes

--- 192.168.77.9 ping statistics ---
8 packets transmitted, 0 packets received, 100% packet loss
sh-2.05a# ping 192.168.77.10
PING 192.168.77.10 (192.168.77.10): 56 data bytes
64 bytes from 192.168.77.10: icmp_seq=0 ttl%5 time\x14.7 ms
64 bytes from 192.168.77.10: icmp_seq=1 ttl%5 time=7.6 ms
64 bytes from 192.168.77.10: icmp_seq=2 ttl%5 time=7.6 ms
64 bytes from 192.168.77.10: icmp_seq=3 ttl%5 time=7.6 ms
64 bytes from 192.168.77.10: icmp_seq=4 ttl%5 time=7.6 ms

--- 192.168.77.10 ping statistics ---
5 packets transmitted, 5 packets received, 0% packet loss
round-trip min/avg/max = 7.6/9.0/14.7 ms
sh-2.05a# 

Re: [Linux-ia64] simeth problem...

[Stephane Eranian]

Peter,

On Tue, Mar 05, 2002 at 11:36:19AM +1100, Peter Chubb wrote:
> 	I'm having problems with the simulated ethernet interface.
> 
> >From within the simulator, I can ping any machine on the local network
> except the machine the simulator is being hosted on.
> 
That's normal. Because of the way simeth is implemented you cannot ping 
the local host IP address from within the simulated kernel. 

> I can ping the simulated ethernet from any machine on the network
> except the one the simulator is hosted on.

That's also normal.

The simulated ethernet is using a packet filter and the host interface
is put in promiscuous mode. The filter routes all broadcasts + packet
for the simeth address to the simeth driver, the rest goes to the local
host interface. I believe such configuration forbids sending from the
simeth back to the local host and that's why pinging in any direction does
not work.


-- 
-Stephane

Re: [Linux-ia64] simeth problem...

[Peter Chubb]

>>>>> "Stephane" = Stephane Eranian <eranian@frankl.hpl.hp.com> writes:

peterc> I'm having problems with the simulated ethernet interface.

peterc> From within the simulator, I can ping any machine on the local
peterc> network except the machine the simulator is being hosted on.

Stephane> That's normal. Because of the way simeth is implemented you
Stephane> cannot ping the local host IP address from within the
Stephane> simulated kernel.

Can this be added to the readme file or something?  Or, preferably,
fixed (although that might be too hard, and there be too little interest).  

Another problem I'm having is that if I create lots of simulated discs
only the first two are ever recognised.  The documentation says I can
have up to 26, but only sda and sdb are ever seen by the kernel.

Peter C