Hi all,
I am trying to set Option 054 (server identifier) in my W2k12r2 DHCP server by:
right clicking IPv4 and choosing the "set predefined options..."
add the proper value and the IP address of the server i want in the OFFERS. this is so I can substitute the legal, outward facing IP instead of the internal IP of the server. This is for an ISP and we want the DHCP client to attempt to renew addresses through the legal address and not the internal one, for obvious reasons.
When I do a packet sniff i find two OFFERS, one with the internal IP and one from the external IP. The external is second and apparently is not regarded by the client. i have attached the contents where you can see both of the option 54s. Any idea how to override the first one?
MessageType: OFFER - Type 53+ SubnetMask: 255.255.252.0 - Type 1
+ RenewTimeValue: Subnet Mask: 0 day(s),0 hour(s) 0 minute(s) 30 second(s) - Type 58
+ RebindingTimeValue: Subnet Mask: 0 day(s),0 hour(s) 0 minute(s) 52 second(s) - Type 59
+ IPAddressLeaseTime: Subnet Mask: 0 day(s),0 hour(s) 1 minute(s) 0 second(s) - Type 51
- ServerIdentifier: 172.25.1.104 - Type 54
Code: Server Identifier, 54(0x36)
Length: 4 UINT8(s)
- IpAddress:
IpAddress: 172.25.1.104
+ Router: 76.72.196.1 - Type 3
+ DomainNameServer: 0.134744072.1145077276.1145077275 - Type 6
- DomainName: tvscable.com - Type 15
Code: Domain Name, 15(0x0F)
Length: 13 UINT8(s)
Name: tvscable.com
- ServerIdentifier: 68.64.126.26 - Type 54
Code: Server Identifier, 54(0x36)
Length: 4 UINT8(s)
- IpAddress:
IpAddress: 68.64.126.26
- End:
Code: End of Options, 255(0xFF)