Package: isc-dhcp-relay
Version: 4.2.4-7
Followup-For: Bug #617258
hi,
this is also an issue when using carp¹ to implement vrrp-like failover.
virtual interface(s) managed by the carp userspace daemon are named
$raw_device:carp by default (and by convention), using these interfaces to
relay dhcp requests with isc-dhcp-relay does not work:
root@router1:/home/thoralf# ip add show if172.2001
54: if172.2001@if172: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether a0:36:9f:1c:51:d3 brd ff:ff:ff:ff:ff:ff
inet 172.20.1.1/24 brd 172.20.1.255 scope global if172.2001:carp
inet6 fe80::a236:9fff:fe1c:51d3/64 scope link
valid_lft forever preferred_lft forever
root@router1:/home/thoralf# ip add show if172.2011
58: if172.2011@if172: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether a0:36:9f:1c:51:d3 brd ff:ff:ff:ff:ff:ff
inet 172.20.11.1/24 brd 172.20.11.255 scope global if172.2011:carp
inet6 fe80::a236:9fff:fe1c:51d3/64 scope link
valid_lft forever preferred_lft forever
root@router1:/home/thoralf# dhcrelay -4 -d -i if172.2011 -i if172.2001
172.20.1.30
Internet Systems Consortium DHCP Relay Agent 4.2.4
Copyright 2004-2012 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/if172.2001/a0:36:9f:1c:51:d3
Sending on LPF/if172.2001/a0:36:9f:1c:51:d3
Listening on LPF/if172.2011/a0:36:9f:1c:51:d3
Sending on LPF/if172.2011/a0:36:9f:1c:51:d3
Sending on Socket/fallback
Discarding packet received on if172.2011 interface that has no IPv4 address
assigned.
Discarding packet received on if172.2011 interface that has no IPv4 address
assigned.
Discarding packet received on if172.2011 interface that has no IPv4 address
assigned.
^C
root@router1:/home/thoralf
… as Marc already pointed out, dhcrelay does not crash anymore, but it is not
usable either. it works, however, if the interfaces are renamed:
root@router1:/home/thoralf# ip link set dev if172.2001 down && ip link set
if172.2001 name if172_2001 && ip link set dev if172_2001 up && ip add show
if172_2001
54: if172_2001@if172: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether a0:36:9f:1c:51:d3 brd ff:ff:ff:ff:ff:ff
inet 172.20.1.1/24 brd 172.20.1.255 scope global if172_2001
inet6 fe80::a236:9fff:fe1c:51d3/64 scope link tentative
valid_lft forever preferred_lft forever
root@router1:/home/thoralf# ip link set dev if172.2011 down && ip link set
if172.2011 name if172_2011 && ip link set dev if172_2011 up && ip add show
if172_2011
58: if172_2011@if172: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
state UP
link/ether a0:36:9f:1c:51:d3 brd ff:ff:ff:ff:ff:ff
inet 172.20.11.1/24 brd 172.20.11.255 scope global if172_2011
inet6 fe80::a236:9fff:fe1c:51d3/64 scope link tentative
valid_lft forever preferred_lft forever
root@router1:/home/thoralf# dhcrelay -4 -d -i if172_2011 -i if172_2001
172.20.1.30
Internet Systems Consortium DHCP Relay Agent 4.2.4
Copyright 2004-2012 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/if172_2001/a0:36:9f:1c:51:d3
Sending on LPF/if172_2001/a0:36:9f:1c:51:d3
Listening on LPF/if172_2011/a0:36:9f:1c:51:d3
Sending on LPF/if172_2011/a0:36:9f:1c:51:d3
Sending on Socket/fallback
Forwarded BOOTREQUEST for 00:1e:37:cb:a6:6a to 172.20.1.30
Forwarded BOOTREPLY for 00:1e:37:cb:a6:6a to 172.20.11.10
^C
root@router1:/home/thoralf
… everything fine and dandy, vlan interfaces are not an issue.
anyway, changing the interface names on our production servers is next to
impossible - a lot of scripts depend on the :carp suffix to figure out what
should happen with certain interfaces in case a router goes down or comes up.
and i'm not sure if carp would work anymore if the suffix is omitted.
to make things worse, i was not able to get dhcp-helper to work with vlan
interfaces, either.
with kind regards,
thoralf.
-- System Information:
Debian Release: 7.1
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages isc-dhcp-relay depends on:
ii debconf [debconf-2.0] 1.5.49
ii debianutils 4.3.2
ii isc-dhcp-common 4.2.4-7
ii libc6 2.17-92
isc-dhcp-relay recommends no packages.
isc-dhcp-relay suggests no packages.
-- debconf information:
* isc-dhcp-relay/servers: 172.20.1.30
* isc-dhcp-relay/interfaces: if172.2011 if172.2004
* isc-dhcp-relay/options:
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