DHCP IP helper address

MAXDUET

I config DHCP pools on core router but i have troouble that which address will be my dhcp add ? if i give on each serial lik its own serial address on core router and other é routers facing clients but still didnt work.

any idea ?

Jon_Cisco

Sorry but I am not sure what you are asking. What is your current DHCP config?

MAXDUET

dhcp is on core




!
ip dhcp excluded-address 172.16.0.1
ip dhcp excluded-address 172.16.0.129
ip dhcp excluded-address 172.16.0.193
ip dhcp excluded-address 172.16.1.1
ip dhcp excluded-address 172.16.2.1
ip dhcp excluded-address 172.16.2.193
ip dhcp excluded-address 172.16.2.129
ip dhcp excluded-address 172.16.2.225
ip dhcp excluded-address 172.16.3.1
ip dhcp excluded-address 172.16.3.9
ip dhcp excluded-address 172.16.3.17
!
ip dhcp pool vlan110
network 172.16.0.0 255.255.255.128
default-router 172.16.0.1
dns-server 172.16.3.6
ip dhcp pool Vlan120
network 172.16.0.128 255.255.255.192
default-router 172.16.0.129
dns-server 172.16.3.6
ip dhcp pool Vlan140
network 172.16.1.0 255.255.255.224
default-router 172.16.1.1
dns-server 172.16.3.6
ip dhcp pool VLAN130
network 172.16.0.192 255.255.255.192
default-router 172.16.0.193
dns-server 172.16.3.6
ip dhcp pool Vlan210
network 172.16.2.0 255.255.255.128
default-router 172.16.2.1
dns-server 172.16.3.6
ip dhcp pool Vlan220
network 172.16.2.192 255.255.255.224
default-router 172.16.2.193
dns-server 172.16.3.6
ip dhcp pool Vlan230
network 172.16.2.128 255.255.255.192
default-router 172.16.2.129
dns-server 172.16.3.6
ip dhcp pool Vlan240
network 172.16.2.224 255.255.255.240
default-router 172.16.2.225
dns-server 172.16.3.6
ip dhcp pool Vlan300
network 172.16.3.0 255.255.255.248
default-router 172.16.3.1
dns-server 172.16.3.6
ip dhcp pool Vlan400
network 172.16.3.8 255.255.255.248
default-router 172.16.3.9
dns-server 172.16.3.6
ip dhcp pool Vlan500
network 172.16.3.16 255.255.255.248
default-router 172.16.3.17
dns-server 172.16.3.6

MAXDUET

again my post is waiting for approval.i pasted dhcp config. DHCP is on core router pools for vlans and ip for vlans needs to have by dhcp . admin pc is getting ip from dhcp but other side of serial connection to other routers that are connected to other vlans they are not getting ip from dhcp . i put ip helper on core router serial connections and then i put ip helper on other 2 routers g0/0 AND G0/1 interfaces ... but that was when i config my dhcp on a server that is also a dns server . but now i config dhcp on core router what should be my ip helperadd for dhcp that is on core router ? ip address of each serial add going to other routers ?

MAXDUET

config a dhcp server on router , we give pool addresses etc but what will be the dhcp server add ?

Zartanasaurus

The helper address will be an address on your core router that is reachable from relays. It doesn't have to be a specific one, just one they can reach. You can make a loopback on core and route to that if you want a consistent config.