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 -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org