dhcpcd-discuss

Hi David

On 12/12/2013 23:05, David McGurty wrote:
> I'm having trouble configuring dhcpcd to use arping and assign a
> static ip address depeding on which profile matches. This is the
> relevant part of my configuration:
>
> interface bond0
> arping 192.168.1.1 192.168.3.1
>
> profile 00:11:22:33:44:55
> static ip_address=192.168.1.2/24
> static routers=192.168.1.1
> static domain_name_servers=208.67.222.222 208.67.220.220 192.168.1.1
>
> profile 55:44:33:22:11:00
> static ip_address=192.168.3.70/24
> static routers=192.168.3.1
> static domain_name_servers=208.67.222.222 208.67.220.220 192.168.3.1
>
> This does almost work as expected, in that it selects the correct
> profile when I'm connected to the router that has the matching MAC
> address. However it only ever works for the first IP that is listed in
> the "arping"-line
>
> So when 192.168.1.1 is first in line, it will load the
> 00:11:22:33:44:55 profile when I'm connected to that router, but it
> won't load the 55:44:33:22:11:00 profile when I'm connected to the
> other router.
>
> When I try to connect to the 55:44:33:22:11:00 router with the above
> configuration, it will fall back to acquiring a lease through DHCP
> after sending ARP probes for the first profile's MAC:
>
> Dec 13 00:02:27 host dhcpcd[24965]: version 6.1.0 starting
> Dec 13 00:02:27 host dhcpcd[24965]: bond0: executing
> `/usr/lib/dhcpcd/dhcpcd-run-hooks' PREINIT
> Dec 13 00:02:27 host dhcpcd[24965]: bond0: executing
> `/usr/lib/dhcpcd/dhcpcd-run-hooks' CARRIER
> Dec 13 00:02:27 host dhcpcd[24965]: bond0: soliciting an IPv6 router
> Dec 13 00:02:27 host dhcpcd[24965]: bond0: sending Router Solicitation
> Dec 13 00:02:27 host dhcpcd[24965]: bond0: using ClientID
> ff:00:00:00:04:00:01:00:01:19:f6:85:31:a0:88:b4:a4:68:d8
> Dec 13 00:02:28 host dhcpcd[24965]: bond0: searching for 192.168.3.1
> Dec 13 00:02:28 host dhcpcd[24965]: bond0: sending ARP probe (1 of 3),
> next in 1.40 seconds
> Dec 13 00:02:29 host dhcpcd[24965]: bond0: sending ARP probe (2 of 3),
> next in 1.67 seconds
> Dec 13 00:02:31 host dhcpcd[24965]: bond0: sending ARP probe (3 of 3),
> next in 2.00 seconds
> Dec 13 00:02:31 host dhcpcd[24965]: bond0: sending Router Solicitation
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: soliciting an IPv6 router
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: sending Router Solicitation
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: using ClientID
> ff:00:00:00:04:00:01:00:01:19:f6:85:31:a0:88:b4:a4:68:d8
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: soliciting a DHCP lease
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: sending DISCOVER (xid
> 0x5e84babf), next in 3.23 seconds
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: offered 192.168.1.101 from
> 192.168.1.1
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: sending REQUEST (xid
> 0x5e84babf), next in 4.00 seconds
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: acknowledged 192.168.1.101
> from 192.168.1.1
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: checking for 192.168.1.101
> Dec 13 00:02:33 host dhcpcd[24965]: bond0: sending ARP probe (1 of 3),
> next in 1.75 seconds
> Dec 13 00:02:34 host dhcpcd[24965]: bond0: sending ARP probe (2 of 3),
> next in 1.69 seconds
> Dec 13 00:02:36 host dhcpcd[24965]: bond0: sending ARP probe (3 of 3),
> next in 2.00 seconds
> Dec 13 00:02:37 host dhcpcd[24965]: bond0: sending Router Solicitation
> Dec 13 00:02:38 host dhcpcd[24965]: bond0: leased 192.168.1.101 for
> 604800 seconds
> Dec 13 00:02:38 host dhcpcd[24965]: bond0: renew in 302400 seconds,
> rebind in 529200 seconds
> Dec 13 00:02:38 host dhcpcd[24965]: bond0: adding IP address 
> 192.168.1.101/24
> Dec 13 00:02:38 host dhcpcd[24965]: bond0: adding host route to
> 192.168.1.101 via 127.0.0.1
> Dec 13 00:02:38 host dhcpcd[24965]: bond0: adding route to 
> 192.168.1.0/24
> Dec 13 00:02:38 host dhcpcd[24965]: bond0: adding default route via 
> 192.168.1.1
> Dec 13 00:02:38 host dhcpcd[24965]: bond0: writing lease
> `/var/lib/dhcpcd/dhcpcd-bond0.lease'
> Dec 13 00:02:38 host dhcpcd[24965]: bond0: executing
> `/usr/lib/dhcpcd/dhcpcd-run-hooks' BOUND
> Dec 13 00:02:38 host dhcpcd[24965]: forking to background
>
>
> If is do a switcheroo and change the "arping"-line to read: "arping
> 192.168.3.1 192.168.1.1", it works. However it then won't work for the
> other router.
>
> The example in the manpage suggests to use the router's IP address in
> the "profile" line instead of using the MAC. I tried that and it
> doesn't work at all. It just always falls back to using DHCP.
>
> Am I missing something here? Any help is appreciated!

Heh, you must be the 2nd person to use the very nice but underused 
feature ;)

Fixed here:
http://roy.marples.name/cgi-bin/gitweb.cgi?p=dhcpcd.git;a=commitdiff;h=c53d79103a91e70f473d17df3caa301be615d25a

If you can't apply the patch then just specify the arping ip's on 
different lines like so:
interface bond0
arping 192.168.1.1
arping 192.168.3.1

And it should work

Thanks

Roy