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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.
Thanks!
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"David G." < [hidden email]> 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!
--
Pavel
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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
192.168.1.0/24 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
Not all dhcp clients are capable of utilizing them
though.
Bill
On 6/2/2017 2:31 AM, Pavel Zhukov
wrote:
"David G." [hidden email] 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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[hidden email]
https://lists.isc.org/mailman/listinfo/dhcp-users
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On Fri, Jun 2, 2017, at 12:44 PM, Bob Harold wrote:
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
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
Not all dhcp clients are capable of utilizing them
though.
Bill
On 6/2/2017 2:31 AM, Pavel Zhukov
wrote:
"David G." [hidden email] 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!
Try adding this to your DHCP configuration:
on commit {
log(info,
concat("REQUEST-LIST",
" IP=",binary-to-ascii(10,8,".",leased-address),
" MAC=",binary-to-ascii(16,8,":",hardware),
" req-list=",binary-to-ascii(10,8,",",option dhcp-parameter-request-list)
)
);
}
Each time a lease is issued, it will log the list of DHCP options that the client requested. If the client does not request code 121 or 249, then the server will not send them, because the client does not expect them and probably won't know what to do with them.
--
Bob Harold
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Thank you for the answers. I'll look into these options. I'm actually using a mix of different clients, so the operating systems vary across the machines. A major problem was the DHCP software was sending a 'classful' route with a netmask of 255.255.255.255. That was pretty useless in my case.
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