dhcp relay - not working.

[foomail123]

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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