[Dnsmasq-discuss] Configuring Hotspot for iOS 3G/4G - to not supply the router field

[Lee Moore]

Hi All,

I would greatly appreciate some help on my issue.
(and I am a total novice at setting up dnsmasq!)

I have a raspberry PI acting as a standalone WiFi Hotspot serving web pages.
I use hostapd, dnsmasq, as per instructions here :-
https://frillip.com/using-your-raspberry-pi-3-as-a-wifi-access-point-with-hostapd/

My dnsmasq.conf is as follows

interface=wlan0
listen-address=192.168.1.1
bind-interfaces
server=8.8.8.8
domain-needed
bogus-priv
dhcp-range=192.168.1.20,192.168.1.90,12h

When I connect from an iOS device, the iOS device is allocated the
following network parameters

IP: 192.168.1.[20 - 90]
Broadcast: 255.255.255.0
Router: 192.168.1.1
DNS: 192.168.1.1

The Router setting of 192.168.1.1 is a real problem, this stops traffic
not intended for the HotSpot from using the
3G/4G interface.
So in other words, I only want traffic targetted at 192.168.1.X to go to
the WiFi hotspot, all other traffic to go through
the 3G/4G interface.

I can set the iOS network parameters manually, omitting the Router field, eg

IP: 192.168.1.10
Broadcast: 255.255.255.0
DNS: 192.168.1.1

The above works perfectly. traffic intended for the hotspot goes to the
hotspot, all else goes through the cellular
3G/4G interface.

I am hoping there is some way to configure this automatically, rather
than manually.
On a previous Raspbian release I used udhcpd, and I was able to undefine
the 'router', and this worked perfectly

Many Thanks in advance
Lee

[Lee Moore]

For anybodys information, I found a solution here

http://www.linksysinfo.org/index.php?threads/dhcp-force-no-default-route.68176/

Actually, I've used something like this for some time to prevent the
inclusion of a default route over DHCP (this was in concert with
dhcp-mac=openvpn,00:ff:*:*:*:*
dhcp-option=openvpn,option:router
Works fine.
Rodney

I changed it slightly to be

dhcp-mac=nodefroute,*:*:*:*:*:*
dhcp-option=nodefroute,option:router

This did the trick!
Very Happy

thx
Lee

Hi All,
I would greatly appreciate some help on my issue.
(and I am a total novice at setting up dnsmasq!)
I have a raspberry PI acting as a standalone WiFi Hotspot serving web pages.
I use hostapd, dnsmasq, as per instructions here :-
https://frillip.com/using-your-raspberry-pi-3-as-a-wifi-access-point-with-hostapd/
My dnsmasq.conf is as follows

interface=wlan0
listen-address=192.168.1.1
bind-interfaces
server=8.8.8.8
domain-needed
bogus-priv
dhcp-range=192.168.1.20,192.168.1.90,12h

When I connect from an iOS device, the iOS device is allocated the
following network parameters

IP: 192.168.1.[20 - 90]
Broadcast: 255.255.255.0
Router: 192.168.1.1
DNS: 192.168.1.1

The Router setting of 192.168.1.1 is a real problem, this stops traffic
not intended for the HotSpot from using the
3G/4G interface.
So in other words, I only want traffic targetted at 192.168.1.X to go to
the WiFi hotspot, all other traffic to go through
the 3G/4G interface.
I can set the iOS network parameters manually, omitting the Router field, eg

IP: 192.168.1.10
Broadcast: 255.255.255.0
DNS: 192.168.1.1

The above works perfectly. traffic intended for the hotspot goes to the
hotspot, all else goes through the cellular
3G/4G interface.
I am hoping there is some way to configure this automatically, rather
than manually.
On a previous Raspbian release I used udhcpd, and I was able to undefine
the 'router', and this worked perfectly
Many Thanks in advance
Lee
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