relay - unconfigured interfaces

[foomail123]

How do I enable relay
a) to listen to dhcp packets on all interfaces
b) to receive dhcp packets on unconfigured (IP)
interfaces.

I modified src/discover.c:
to invoke always
omapi_register_io_object(...)

However I see no DISCOVER packets are received.

Any suggestions ?

--- foomail123 <foomail123 at yahoo.com> wrote:

> 
> Thank you for information.
> However, I have situation 
> 1) interfaces are not configured when dhcp relay is
> started. How does dhcp relay get refreshed/notified
> ?I
> modified dhcrelay.c to:
>         discover_interfaces (DISCOVER_UNCONFIGURED);
> but does not work !
> 
> 2) I want dhcrelay to listen not on just one but 
> a set of interfaces. How do I get this going ?
> 
> Right now, dhcrelay does not receive any dhcp
> packets
> !
> 
> 
> Thanks,
> 
> 
> 
> --- Glenn Satchell <Glenn.Satchell at uniq.com.au>
> wrote:
> 
> > 
> > >Date: Tue, 8 Aug 2006 17:09:31 -0700 (PDT)
> > >From: foomail123 <foomail123 at yahoo.com>
> > >Subject: dhcp relay - not working.
> > >To: dhcp-users at isc.org
> > >
> > >Hi,
> > >
> > >This is using rel: 3.0.4 on Redhat Linux: 6.x/x86
> > >
> > >I see select() being invoked but.. relay(..)
> > routine
> > >is not being invoked. I am running through
> debugger
> > 
> > >and get following output:
> > >
> > >
> > >omapi_one_dispatch (wo=0x0, t=0x0) at
> > >src/omapip_dispatch.c:399
> > >399             for (io = omapi_io_states.next;
> io;
> > io
> > >= io -> next) {
> > >(gdb) p /x io
> > >$4 = 0x54430
> > >(gdb) p /x omapi_io_states
> > >$5 = {type = 0x535a8, refcnt = 0x1, handle = 0x0,
> > >outer = 0x0, inner = 0x0, next = 0x54430, readfd
> =
> > >0x0, writefd = 0x0, 
> > >  reader = 0x0, writer = 0x0, reaper = 0x0}
> > >(gdb) 
> > >(gdb) p /x io
> > >$4 = 0x54430
> > >(gdb) p /x omapi_io_states
> > >$5 = {type = 0x535a8, refcnt = 0x1, handle = 0x0,
> > >outer = 0x0, inner = 0x0, next = 0x54430, readfd
> =
> > >0x0, writefd = 0x0, 
> > >  reader = 0x0, writer = 0x0, reaper = 0x0}
> > >(gdb) b relay
> > >Breakpoint 5 at 0x17154: file src/dhcrelay.c,
> line
> > >363.
> > >(gdb) c
> > >Continuing.
> > >
> > >
> > >Any suggestions ?
> > >
> > >Thanks !
> > 
> > What are the command line parameters you are
> > starting dhcrelay with?
> > 
> > Note there is a potential trap with specifying the
> > interfaces to listen
> > on. You *must* specify not only the interface to
> > listen for dhcp
> > requests but *also* replies from the dhcp server
> if
> > that happens to be
> > a different interface. Usually the default
> behaviour
> > (listen on all
> > interfaces) is the correct one.
> > 
> > This is from the dhcrelay man page:
> > 
> >      The -i flag can be used to specify the
> network
> > interfaces on
> >      which  the  relay agent should listen.   In
> > general, it must
> >      listen not only on those network interfaces
> to
> > which clients
> >      are  attached, but also on those network
> > interfaces to which
> >      the server (or  the  router  that  reaches 
> the
> >  server)  is
> >      attached.
> > 
> > Also dhcrelay only works for interfaces like
> > ethernet, token ring and
> > fddi (and a few others) but it does not work on
> PPP
> > and other
> > non-broadcast interface types.
> > 
> > regards,
> > -glenn
> > 
> > 
> > 
> 
> 
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