i'm interested if it's possible to set the NTP server via DHCP on an 2901 Router with 15.2(2) image.
i configured the interface gigabit 0/0 as dhcp client. The DHCP Server sends to me DNS, Default GW and NTP. All is working fine, but the NTP will not be configured. i tried to add an DHCP option request, but there is no NTP (42) value
Router2901(config-if)#ip dhcp client request ?
classless-static-route Classless static route (121)
dns-nameserver DNS nameserver (6)
domain-name Domain name (15)
netbios-nameserver NETBIOS nameserver (44)
router Default router option (3)
sip-server-address SIP server address (120)
static-route Static route option (33)
tftp-server-address TFTP server address (150)
vendor-identifying-specific Vendor identifying specific info (125)
vendor-specific Vendor specific option (43)
is there any way to add the value NTP (42) for the DHCP request or isnt it possible?
...answer from TAC
NTP via DHCP request
Current IOS implementation doesn’t support option 42 in DHCP client.
At least you have responded back to the thread .... usually people just leave the thread open as it.
Old thread but I thought that I would respond to it. There's two formats that the IP address can be passed to the host. Hex format or ASCII format. I've run into IP phones (Aastra specifically) that are expecting the IP addresses to be passed to them using ASCII format. Here's examples:
option 42 ip 126.96.36.199 <= hex format
option 42 ascii "188.8.131.52" <= ascii format
What if we have normal windows hosts getting IP address via a DHCP server which i a router??
It looks like adding "option 42 ip
ip dhcp pool VLAN10
network 184.108.40.206 255.255.255.0
option 42 ip 220.127.116.11