[Q] Custom DNS settings - Galaxy S II Q&A, Help & Troubleshooting

Hi,
I am currently trying to find a way to change the DNS settings on my S II. I want to implement the posibillity to set the DNS IP in the settings of my cyanogenmod ROM.
But it seems like its impossible to set a custom DNS for mobile networks on the SII.
I found out that Android stores its DNS settings as properties.
- net.dnsX for the current active DNS
- and also dhcp.wlan0.dnsX when connected to WiFi,
- or net.rmnet0.dnsX when connected to a mobile network.
I was able to change this settings manually with the "setprop" utility and also automatically by modifying "20-dns.conf" from dhcpcd for WiFi and "ConnectivityService.java" for mobile networks.
For WiFi this works without any problems, but for mobile networks these settings seem to be ignored completely. Android still uses the DNS settings from my provider. I was searching through the complete android source to find an indication where the dns settings are stored that are actually used, but I have found nothing.
First I thought my provider is routing all requests to port 53 to their own servers but even if I set the DNS address to 127.0.0.1, all requests are still resolved.
Has anyone tried this before or even sucsessfully changed the DNS settings for mobile networks on the S2?
I belive the DNS settings for mobile networks are handled in some binary blobs (from Samsung?), maybe libsec-ril.so.
Does anyone have what I can do?
While searching through the net I found out that this is working for other devices, so I dont really understand why samsung would ignore the properties in their code.
Siloportem

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I spent most of a day trying to get an APN definition for MMS working on my new (and first) smartphone. Searching for answers, I found a lot of conflicting information regarding the meaning and specification of "APN type." I finally decided to go to the source (code) to understand. Here's what I found for Android 4.1.1 (sorry if this is duplicative, but nowhere could I find an exhaustive list):
from /android/4.1.1/frameworks/base/telephony/java/com/android/internal/telephony/Phone.java, /android/4.1.1/frameworks/base/telephony/java/com/android/internal/telephony/DataConnectionTracker.java, and /android/4.1.1/frameworks/base/core/java/android/net/ConnectivityManager.java
default any type for which no APN entry is defined
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supl Secure User Plane Location, geographic device location
dun Dial Up Networking bridge
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ims IP Multimedia Subsystem
fota Over the air Adminstration
cbs Carrier Branded Services
* all types of traffic (literal asterisk string)
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from /android/4.1.1/frameworks/base/core/java/android/net/ConnectivityManager.java
MMS An MMS-specific Mobile data connection. This connection may be the same as TYPE_MOBILE but it may be different. This is used by applications needing to talk to the carrier's Multimedia Messaging Service servers. It may coexist with default data connections.
SUPL A SUPL-specific Mobile data connection. This connection may be the same as TYPE_MOBILE but it may be different. This is used by applications needing to talk to the carrier's Secure User Plane Location servers for help locating the device. It may coexist with default data connections.
DUN A DUN-specific Mobile data connection. This connection may be thesame as TYPE_MOBILE but it may be different. This is used by applicaitons performing a Dial Up Networking bridge so that the carrier is aware of DUN traffic. It may coexist with default data connections.
HIPRI A High Priority Mobile data connection. This connection is typically the same as TYPE_MOBILE but the routing setup is different. Only requesting processes will have access to the Mobile DNS servers and only IP's explicitly requested via requestRouteToHost will route over this interface if a default route exists.
IMS IP Multimedia Subsystem
FOTA Over the air Adminstration.
CBS Carrier Branded Services
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Thank you for sharing.
I know it's an old post but I won't to open a new thread since I think this is still gave good informations about apn.
I would like to know if it's useful tu change apn type values manually.
My previous carrier(wind) in type apn had this values:
Code:
default,supl,agps,fota,dun
.
My current carrier (kena mobile) has just
Code:
default
in apn type and
Code:
pap
in authentication method.
This are the settings obtained via carrier auto-configuration procedure for Moto G5 plus(my smartphone).
What do you think? It's useful tu add different values after
Code:
default
or it's a total waste of time since the carrier system override what you set locally on your device?
Thank you very much.
there's also the "admin" type which you can use for using duplicated SIM cards.
T-Mobile's APN settings for the LG ThinQ has a type called "xcap":
Sorry, don't have enough posts to include the link.
Anyone know what xcap is for? I Googled for this APN type value, but haven't found anything about this value.
Thanks,
Q
Thanks for the info. Valuable information in this post. Thumbs up!

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