[pkg-dhcp-devel] Bug#648401: Harmfull with debconf
Geert Stappers
stappers at stappers.nl
Fri Mar 16 14:40:39 UTC 2012
Hello ISC DHCP maintainers,
Bug 648401, isc-dhcp-relay: dhcrelay(8) doesn't mention need for -i on server facing interface,
is harmfull in combination with current debconf text.
The text in
+--------------------------| DHCP Relay |-----------------------------+
| |
| Please specify which network interface(s) the DHCP relay should |
| attempt to configure. Multiple interface names should be entered |
| as a space-separated list. |
| |
| Leave this field blank to allow for automatic detection and |
| configuration of network interfaces by the DHCP relay, in which |
| case only broadcast interfaces will be used (if possible). |
| |
| Interfaces the DHCP relay should listen on: |
| |
| __________________________________________________________ |
| |
| <Ok> |
| |
+---------------------------------------------------------------------+
did trick me to enter only the interface I thought it should listen on.
It took me several hours to find that it is actual asking:
Enumerate all involved interfaces,
so that remaining interfaces can be excluded.
Leaving the interface list empty,
did get my (two interface) DHCP relay working in the end.
Having the patch
--- dhcrelay.8.orig 2011-11-11 16:41:22.000000000 +1100
+++ dhcrelay.8 2011-11-11 16:43:01.000000000 +1100
@@ -178,7 +178,10 @@
interfaces may be specified by using more than one \fB-i\fR option. If
no interfaces are specified on the command line, dhcrelay will identify
all network interfaces, eliminating non-broadcast interfaces if possible,
-and attempt to listen on all of them.
+and attempt to listen on all of them. If you use -i, you should ensure you
+include an -i option for the interface that is used to communicate with the
+DHCP server. Otherwise reply packets from the DHCP server are likely to be
+dropped.
.TP
-m \fIappend\fR|\fIreplace\fR|\fIforward\fR|\fIdiscard\fR
Control the handling of incoming DHCPv4 packets which already contain
in the manual page would have me saved some time
and will surely save time for others.
Thanks & Cheers
Geert Stappers
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