DHCP and Route Priority
Bill Shirley
bill at c3po.polymerindustries.biz
Fri Jun 2 19:36:35 UTC 2017
Classless static routes are used by an OS because they're more specific:
# ------------------------------------------------------------------------------
option classless-static-routes code 121 = array of unsigned integer 8; # for Windows Vista and other non Windows DHCP
clients
option classless-static-routes-ms code 249 = array of unsigned integer 8; # for Windows 2000 and XP clients
# ------------------------------------------------------------------------------
subnet 10.0.0.0 netmask 255.0.0.0 {
option routers 10.96.0.12;
.
.
option classless-static-routes
24,192,168,1, 10,96,0,9, # lan1 192.168.1.0/24 gw 10.96.0.9
23,192,168,64, 10,96,0,9, # site #2 192.168.64.0/23
32,192,168,5,2, 10,96,0,76; # serverB 192.168.5.2/32
option classless-static-routes-ms
24,192,168,1, 10,96,0,9, # lan1 192.168.1.0/24gw 10.96.0.9
23,192,168,64, 10,96,0,9, # site #2 192.168.64.0/23
32,192,168,5,2, 10,96,0,76; # serverB 192.168.5.2/32
Not all dhcp clients are capable of utilizing them though.
Bill
On 6/2/2017 2:31 AM, Pavel Zhukov wrote:
> "David G." <lightman at fastmail.fm> writes:
>
>> Hi,
>>
>> How can I communicate the priority of routes and routers via DHCP? I'm
>> trying to get computers on my network to use another router for a
>> specific subnet but everything is just going to the default gateway. I'm
>> using DHCP option 121 to set the route.
> Hi,
> Which OS are you using? Classless routes should be set by dhclient script which is
> vendor specific.
>> Thanks!
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