A friend of mine has been using the dummy device to establish another
local address for his system. He does this so that he can have
multiple IP addresses - so that the NCSA server can use multiple
document roots.
I do this myself on 1.2.11.
Recently, he upgraded from 1.2.8 to to 1.3.88. His dummy device quit
working, and he asked me to help.
I did the usual stuff:
1. Created a dummy device by loading a dummy.o module. I did a make
modules in his source tree and loaded the module from there to make
sure that it was at the right level.
2. Did an ifconfig to give the dummy device the right IP address.
3. Added a host route to the dummy device for that particular IP
address.
4. Set up an arp for that IP address so that it would answer to it on
the ethernet. This was on the eth1 interface, and the arp command he
had wouldn't work, since he has two ethernet cards, and was issuing an
old arp ioctl that was not specifying the interface. I got an old
copy of arp and hacked in a '-D interface' parameter to it so that I
could set an arp on eth1, and verified it by using cat /proc/net/arp
(A good reason to make those pseudo-files human readable). Using
tcpdump, I verified that the arp was actually working (I had
previously verified that no one was answering the who-has).
However, I can't ping the address, and I can't set up a TCP connection
to that address. If I try to ping the address from the system that
has the dummy device, I get
ping: sendto: Operation not permitted
ping: wrote xxxxxxxx.yyy 64 chars, ret=-1
- From other systems, the echo response never comes out.
The only thing I can assume is the address that is ifconfig'ed into
the dummy device is no longer being added to the list of local IP
addresses.
Is this a known bug, or should I dig further into the code?
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Nick Simicich - njs@scifi.emi.net - (last choice) njs@bcrvm1.vnet.ibm.com
http://scifi.emi.net/njs.html -- Stop by and Light Up The World!