Options
Good Article on DHCP
Everyone know that configuring a router as a DHCP server on the same subnet is easy. Hopefully this thread will make it easy for people like me that was not clear on how to set up a central DHCP server to serve multiple subnets. The important part of the DHCP header is the giaddr field which is the address of the Interface of ip helper address command
http://articles.techrepublic.com.com/5100-6345_11-5034551.html?tag=rbxccnbtr1
Here is from Cisco Docs
DHCP defines a process by which the DHCP Server knows the IP subnet in which the DHCP client resides, and it can assign an IP address from a pool of valid IP addresses in that subnet.
The DHCP Server identifies which DHCP address pool to use to service a client request as follows:
•If the client is not directly connected (the giaddr field of the DHCPDISCOVER broadcast message is non-zero), the DHCP Server matches the DHCPDISCOVER with a DHCP pool that has the subnet that contains the IP address in the giaddr field.
•If the client is directly connected (the giaddr field is zero), the DHCP Server matches the DHCPDISCOVER with DHCP pool(s) that contain the subnet(s) configured on the receiving interface. If the interface has secondary IP addresses, the subnets associated with the secondary IP addresses are examined for possible allocation only after the subnet associated with the primary IP address (on the interface) is exhausted.
http://articles.techrepublic.com.com/5100-6345_11-5034551.html?tag=rbxccnbtr1
Here is from Cisco Docs
DHCP defines a process by which the DHCP Server knows the IP subnet in which the DHCP client resides, and it can assign an IP address from a pool of valid IP addresses in that subnet.
The DHCP Server identifies which DHCP address pool to use to service a client request as follows:
•If the client is not directly connected (the giaddr field of the DHCPDISCOVER broadcast message is non-zero), the DHCP Server matches the DHCPDISCOVER with a DHCP pool that has the subnet that contains the IP address in the giaddr field.
•If the client is directly connected (the giaddr field is zero), the DHCP Server matches the DHCPDISCOVER with DHCP pool(s) that contain the subnet(s) configured on the receiving interface. If the interface has secondary IP addresses, the subnets associated with the secondary IP addresses are examined for possible allocation only after the subnet associated with the primary IP address (on the interface) is exhausted.
Studying for CCIE and drinking Home Brew
Comments
-
Options
kryolla
Member Posts: 785
-
Options
dtlokee
Member Posts: 2,378 ■■■■□□□□□□
<sarcasm>
Yeah because often in the field your focus is so narrow when you get into the classroom it covers way more than you need in the field
</sarcasm>
Of course looking stuff up on google isn't going to be an exam objective either.The only easy day was yesterday! -
Optionsdtlokee
Member Posts: 2,378 ■■■■□□□□□□
One of the side effects of studying for the CCIE lab is I now find ways to come up with 10 oddball solutions to a simple problem.The only easy day was yesterday!
-
Options
sprkymrk
Member Posts: 4,884 ■■■□□□□□□□
dtlokee wrote:One of the side effects of studying for the CCIE lab is I now find ways to come up with 10 oddball solutions to a simple problem.
And you could come up with 1,435,237 more in .0435 seconds if you had your Google+ cert. :PAll things are possible, only believe. -
Options
AlanJames
Member Posts: 230
good read. ip helper-address is your friend when using a windows DHCP server, -
Options
sir_creamy_
Inactive Imported Users Posts: 298
kryolla wrote:RFC are good for theory but how do you apply that theory in the real world.
Try to write a simple FTP client/server from scratch without consulting the corresponding RFC. How can you implement a protocol if you don't know its specification?
Developers bathe themselves in RFCs.Bachelor of Computer Science
[Forum moderators are my friends]
