Re: dhcpcd ignores netmask from server, installs /8 or /24 instead

[Roy Marples <roy%marples.name@localhost>]

On Friday 12 Dec 2014 23:55:23 Roy Marples wrote:
> On Friday 12 Dec 2014 15:51:20 John D. Baker wrote:
> > My ISP's upstream router is operating as a DHCP relay as the DHCP
> > server is on an entirely different network from that presented by
> > the upstream router.  Perhaps this causes confusion?
> 
> Possibly.
> Can you email me a full tcpdump off the DHCP message so I can analyse it
> please?

So far this is the likely culprit.
I tested dhcpcd on a bigendian mips router I have (running linux though) and 
again it installed a /20 fine and was correct for IPv4LL as well.

So very interested in a tcpdump.

> > My ISP seems to suffer prolonged outages of its upstream router, so
> > when the lease expires, an IPv4LL/APIPA address is assigned and this
> > also frequently has the wrong netmask (usually /24 instead of /16).
> > 
> > I don't know if this is architecture-dependent or not.  Perhaps I'll
> > copy my firewall rules over to one of my Soekris net4501s and see how
> > it behaves on an i386 system in place of the sparc system.  (I have a
> > local patch to work around kern/49124 for -7/-current.)
> 
> I cannot replicate this on i386, a /20 is assigned fine from my local ISC
> dhcpd server using dhcpcd-6.6.5.
> 
> I suppose I cannot rule out any architectural problems and I don't have any
> big endian hardware to test on, but I've not heard of any problems with
> dhcpcd on these platforms.
> 
> Does anyone else on bigendian have a problem with dhcpcd and subnet masks?

Roy