[Asterisk-Users] GXP-2000 fw 1.0.1.13 and NTP (SOLVED)

[Philip Edelbrock]

Tony Hoyle wrote:
> Philip Edelbrock wrote:
> 
>>  18  17.161118 Grandstr_05:a9:bf -> Broadcast    ARP Who has 
>> 206.228.191.144?  Gratuitous ARP
>>  19  17.609869 3com_96:2f:eb -> Grandstr_05:a9:bf ARP 206.228.191.144 
>> is at 00:10:4b:96:2f:eb
>>  20  20.155260 206.228.191.144 -> 206.228.191.7 DHCP DHCP Decline  - 
>> Transaction ID 0xffffced0
> 
> 
> It looks like your DHCP server is in fact broken.  It's passing out 
> duplicate addresses - the device 00:10:4b:96:2f:eb already has 
> 206.228.191.144, so the Grandstream (correctly) declines the offer.
> 
> The server then tries to send the same address *again* instead of 
> selecting a new one, and the same sequence ensues.  It should give a 
> different address if the original one is declined.
> 


Ah, you are close!

I figured it out (*hurray!*).  It was in fact a misconfiguration on my 
part.  144 isn't the end of my subnet, 143 is.  So, packet 18 is the 
phone confirming that it owns IP 144.  Packet 19 is from the router 
saying, "no you don't, I own that" (this is a proxy arp setup).  So, the 
phone declines and requests a new IP.  The head scratcher was that for 
the next request, it requests 144 again, so the DHCP server says (again) 
"OK, you got it" and the loop continues.

Once I adjusted my dhcp config to end my dynamic pool at 143 instead of 
144, all was well.

Additionally, I noticed that the phone requests these pieces of info in 
the dhcp response:

- Subnet
- Router
- DNS server(s)
- Time Server(s) <--- !!

So, I additionally put in the dhcp config a time server (the ip for 
time.nist.gov for now).  And after the first reboot, the phone gets an 
IP, pings the dhcp server once, registers, sets it's time, checks for 
firmware updates, and seems perfectly happy.

Hurray!


Phil