The easiest way to see if it's something from the ISP's side is to boot up
your pfSense with the WAN plugged into a switch _all by itself_, or boot up
with a loopback adapter plugged into the WAN port. If it boots up and
doesn't get an IP when it's set up like this, then it's something from the
ISP.

 

Dimitri Rodis

Integrita Systems LLC 

http://www.integritasystems.com

 

From: Karl Fife [mailto:[email protected]] 
Sent: Friday, April 03, 2009 10:51 PM
To: [email protected]
Subject: [pfSense Support] pfSense gets RFC1918 address on WAN interface
after reboot

 

pfSense consistently has a 10.0.1.x address on the WAN interface after
reboot (DHCP client).

pfSense WAN interface gets REAL public IP address only after explicit
release/renew event.

 

This happens every time,

 

To the users it manifests as 'it doesn't work' after a reboot without
administrator intervention.

 

Does anyone have any idea what could be going on here?  I configured pfSense
as a 10.2/16 not a 10./8 because I routinely create PPTP tunnels to other
networks 10.x /16 networks thinking that  this configuration would give me
proper routing.  Perhaps that is not incorrect, and perhaps I have broken
something by choosing 10.2 /16 instead of 10. /8.   

 

 

I originally assumed that someone in my ISP's network had a rogue DHCP
server occasionally filling my WAN interface's DHCP requests. Evidence
against this theory is that pfSense only gets this 'bad' address on reboot,
and it seems to happen 100% of the time, and I can NEVER replicate the
problem with release/renew NOR can I get replicate the problem with a
modem-attached windows host even by trying hard (many times) to be issued a
bad address by aforementioned theoretical ROGUE DHCP server.

 

A higher-up tech at my ISP mumbled some stuff about BSD DHCPD being known to
issue addresses to itself if dhcpd is not configured 100% properly.  I found
this idea somewhat absurd because the 10.0.1.x address is not even in my
subnet, (10.2.x.x/16) neither do I see any noise about the DHCP transaction
in the System Log.  ALTHOUGH dhcpd IS configured to allocate leases between
..1.254 and ..1.1--so at least it's got the third octet right if indeed
there's something's wrong related to /16 vs /8 on a 10. network

 

 

By the way, this happens with 1.2-Release AND with 1.2.2 (embedded on
Soekris 5501)

 

Anybody know what's going on?  Any help or pointers are MUCH appreciated!

 

Thank you!

 

-Karl Fife

 

 

 

 

 

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