Consider eth0 with inet, inet6, dhclient and ip6.dhclient records. These
are currently ordered (alphabetically) as follows.
eth0.dhclient
eth0.inet
eth0.inet6
eth0.ip6.dhclient
Observations:
* IPv4 comes before IPv6
* The prioritization of *dhclient versus inet* is inconsistent.
I propose to change the order to the following.
eth0.inet6
eth0.inet
eth0.ip6.dhclient
eth0.dhclient
That is:
* IPv6 before IPv4
* inet before dhclient
Rationale:
* NetworkManager prioritizes IPv6 before IPv4
* Putting inet before dhclient allows "dns-nameservers" to be used to override
addresses of faulty nameservers coming in via DHCP
Accordingly, here is a first draft of a new factory-shipped interface-
order file.
=== BEGIN ===
# interface-order(5)
lo.inet6
lo.inet
lo.@(dnsmasq|pdnsd)
lo.!(pdns|pdns-recursor)
lo
tun*
tap*
hso*
em+([0-9])?(_+([0-9]))*
p+([0-9])p+([0-9])?(_+([0-9]))*
eth*([^.]).inet6
eth*([^.]).inet
eth*([^.]).ip6.@(dhclient|dhcpcd|pump|udhcpc)
eth*([^.]).@(dhclient|dhcpcd|pump|udhcpc)
eth*
@(ath|wifi|wlan)*([^.]).inet6
@(ath|wifi|wlan)*([^.]).inet
@(ath|wifi|wlan)*([^.]).ip6.@(dhclient|dhcpcd|pump|udhcpc)
@(ath|wifi|wlan)*([^.]).@(dhclient|dhcpcd|pump|udhcpc)
@(ath|wifi|wlan)*
ppp*
*
=== END ===
Testing this by creating a bunch of fake records in a directory...
=== BEGIN ===
# /lib/resolvconf/list-records
lo.inet6
lo.inet
lo.dnsmasq
lo.pdnsd
lo
tun0
tap0
hso0
em0_0
p0p0_0
eth0.inet6
eth0.inet
eth0.ip6.dhclient
eth0.dhclient
wlan0.inet6
wlan0.inet
ath0.ip6.dhclient
wlan0.ip6.dhclient
ath0.dhclient
wlan0.dhclient
ppp0
ppp1
=== END ===
This probably needs some more tweaking. I am not sure what to do about
tun, tap, hso and br so I haven't changed these. The change that
worries me the most is putting eth0.inet before eth0.dhclient whereas
currently (resolvconf 1.69 and earlier) eth0.inet comes after
eth0.dhclient. I think that the change shouldn't affect too many people
because few people have a stanza like the following.
iface eth0 inet dhcp
dns-nameservers 1.2.3.4 # Overridden by DHCP-provided nameserver
addresses
Comments and advice are most welcome.
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https://bugs.launchpad.net/bugs/1094345
Title:
IPv6 DHCP record is too late in resolvconf interface-order
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