Hi, I have dhcpd.conf at home containing:
host { ... }
...
subnet 192.168.1.0 netmask 255.255.255.0 {
option routers 192.168.1.1;
option domain-name "pasta.net";
option domain-name-servers 192.168.1.21;
option ntp-servers time.pasta.net;
# 1-100 are reserved for statically configured hosts.
# 101-150 are reserved for known dynamic hosts (known because they're in host stanzas above).
# e.g. my Android phone on wifi.
pool {
range 192.168.1.101 192.168.1.150;
allow known-clients;
deny unknown-clients;
}
# 151-200 are for unknown dynamic hosts. e.g. visitors' phones on wifi.
pool {
range 192.168.1.151 192.168.1.200;
allow unknown-clients;
deny known-clients;
}
}
This works fine.
I now want to force 'known dynamic hosts'' to use a different gateway.
(In case you're curious: Since, when using wifi, my Android
phone silently refuses to use the DNS server proposed by the above
dhcpd.conf, I now want to change the phone's gateway to a masqueraing
Linux box, where I can hopefully use iptables to force the phone to
use the DNS server proposed by the DHCP server, and thereby block ads.)
The dhcpd.conf man page says:
In general, any parameter can appear anywhere that parameters
are allowed, and will be applied according to the scope in which
the parameter appears.
and I don't see anything special documented about 'option routers'.
So I thought this should work:
subnet 192.168.1.0 netmask 255.255.255.0 {
#option routers 192.168.1.1; <--- commented out at subnet level
...
pool {
range 192.168.1.101 192.168.1.150;
...
option routers 192.168.1.32; <--- this is the different gateway
}
pool {
range 192.168.1.151 192.168.1.200;
...
option routers 192.168.1.1; <--- this is the original gateway
}
but it looks like *no* host gets told its gateway.
To confirm that it wasn't a problem with my new gateway itself, I
put the original gateway in *both* pools, i.e. only the *location* of
the router declaration changes compared to the original configuration:
subnet 192.168.1.0 netmask 255.255.255.0 {
#option routers 192.168.1.1; <--- commented out at subnet level
...
pool {
range 192.168.1.101 192.168.1.150;
...
option routers 192.168.1.1; <--- this is the original gateway
}
pool {
range 192.168.1.151 192.168.1.200;
...
option routers 192.168.1.1; <--- this is the original gateway
}
The result was the same: no gateway.
My googles didn't turn up anything relevant and my experiments (using
'groups' failed), so any advice would be appreciated. I'm using
isc-dhcp-server 4.4.1 on Debian 10. Thanks!
Alexis
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