Hey guys, hoping you can help get my head around this scenario .. im struggling.
Cisco Dhcp Options 150 Example
Option 150 is defined in DHCP not your TFTP server. You'll need to consult your DHCP server documentation on how to define custom options. Each implementation does it differently. Using a Cisco router the Syntax is defined in your DHCP Pool: option 150 ip x.x.x.x. Tftpd32 Dhcp Option 150 Windows. 1/2/2018 0 Comments. DHCP Option 150 is Cisco proprietary. Option 66 is an IEEE standard. PROBLEM OR GOAL: Solution: For Cisco phones IP addresses can be assigned manually or by using DHCP. It seems that in 2008 R2 I do not have this ability. I need to create Option 150 (Cisco IP phone thing) and for the. TFTPD32 with Cisco Phones (Option 150) - posted in Tftpd32: TFTPD32 is a fantastic utility- TFTP server and DHCP all in one- this makes it a great recovery/upgrade tool for most models of Cisco Phone with one caveat- DHCP Option 150. When I had to factory reset a 7965 I had some issues at first too. This should hopefully help out a bit. Make sure that the phone is getting its address via DHCP and that the option 150 is set for your http server address. Recovering Cisco IP Phone 7940 / 7960. Under Global Tab, only enable TFTP Server and DHCP Server. While your TFTP is running, power on the Cisco IP phone. If all goes well, TFTpd32 will log the connection and show the files it requests. The phones will show upgrading firmware.
Dhcp Tftp Option
Basically i want to setup DHCP for my different VLANs, i found various examples around the web but still fail to understand how the correct DHCP scope is selected for a DHCP request..
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If you refer to the diagram on this link http://networkcity.blogspot.com/2010/01/configuring-inter-vlan-routing-and-dhcp.html?spref=fb
Im not sure how a DHCP broadcast from say from a client in VLAN 2 gets an offer from the configured DHCP pool from the router (200.1.1.2) i totally get the ip helper config and i can see the DHCP scopes setup, but how does the router know how to assign the correct IP from the correct subnet for that VLAN.
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I found some explanations online that hint towards the the DHCP server (router) sees that the request is coming from the Vlan2 with the IP address 10.1.2.x/24 so it knows to give the client on that vlan an address from the 10.1.2.x/24 scope.
But i dont see how this information is passed onto the router, ... as the client machine in vlan 2 has no ip/gateway information?? it just sends the broadcast to the layer2 switching network (tagging the frame with the VLAN ID) it gets passed to a trunk on the Catalyst 3550 (our layer 3 switch which will do the routing between the domains) so i presume (as i dont have a layer 3 switch kicking about) the packet is tagged somehow with the correct VLAN interface IP info and then this is forwarded to the router which then just magically selects a IP from the correct DHCP pool?? *sarcasm* lol
becuase we can name them pools anything...
Please shed some light on this as it is driving me mad! thanks
I can only give you part of the picture. DHCP option 66 and Asterisk have nothing to do with each other.
From the sounds of it you are using Elastix (good). Elastix is based on the Centos operating system. The target of DHCP option 66 should be your Elastix server. Under centos you have the tftp service loaded. Tftp is the service referenced by DHCP option 66 (and 67 but that's not used for phone provisioning). To serve files via tftp the files must be loaded in the /tftpboot folder on the Elastix server. Usually (but not always) phone configuration files have two parts. One is a common configuration file for all phones of the same manufacturer. The second configuration file is usually named the mac address of the phone. This is where phone specific settings are stored.
Dhcp Options List
I haven't personally used Yealink phones, but there are other in the community who do (NetworkNerd and SAM). They should be able to fill in that part.