Trying to use wireless N with iwlwifi & network manager

Have all the h/w necessary to use wireless N:
Intel Centrino-N 1030
Linksys E3200 running Tomato 1.28
Linksys E4200 running dd-wrt 21286
Also updated everything today (pacman -Syu):
>uname -a
Linux hostname 3.12.9-2-ARCH #1 SMP PREEMPT Fri Jan 31 10:22:54 CET 2014 x86_64 GNU/Linux
So, with either router set up with as an AP at 2.4GHz and N-Only (the centrino 1030 doesn't support 5GHz), and the module defaults loaded, I see odd behavior. First, once connected to either AP, Network Manager still reports the connection to be at B/G.
I checked the module config, and this part is relevant:
>modinfo iwlwifi | grep 11n
parm: 11n_disable:disable 11n functionality, bitmap: 1: full, 2: agg TX, 4: agg RX (uint)
There's a lot of chatter on the forums about earlier kernels not supporting N w/ iwlwifi, and recommending to disable it with '11n_disable=1' in /etc/modprobe.d/iwlwifi.conf. So I tried explicitly enabling it, and assuming it's a binary value:
>cat /etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable=0
After reloading the module(s) (and restarting wpa_supplicant & networkmanager), the thing I'm finding confusing is that I can see evidence of this change take effect:
>cat /sys/module/iwlwifi/parameters/11n_disable
0
...but it doesn't affect the output of modinfo (same as above), nor am I able to connect to either router at N (NM still reports B/G). Also confused how it connects at all when the routers are set to N-Only?

modinfo iwlwifi
That is not supposed to change. It just shows you the parameters and their valid configurations.
options iwlwifi 11n_disable=0
>cat /sys/module/iwlwifi/parameters/11n_disable
0
Did you check that it was not already 0?
...but it doesn't affect the output of modinfo (same as above), nor am I able to connect to either router at N (NM still reports B/G). Also confused how it connects at all when the routers are set to N-Only?
If the card connects with the routers set to n only, then the card is capable of working with n. I usually check with nm-tools and look at the speed indicated.
Here is the thing: Routers and cards sometimes negotiate a lower speed to prevent intereference with other devices. I usually 'get' N-speed only once I start to saturate the link.

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I'm trying to use kerberos V5 with ActiveDirectory im using simple code from previuos posts but
when i try with correct username/password i get :
Authentication attempt failedjavax.security.auth.login.LoginException: Message stream modified (41)
when i try incorrect username/pass i get :
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import javax.naming.*;
import javax.naming.directory.*;
import javax.security.auth.login.*;
import javax.security.auth.Subject;
import com.sun.security.auth.callback.TextCallbackHandler;
import java.util.Hashtable;
* Demonstrates how to create an initial context to an LDAP server
* using "GSSAPI" SASL authentication (Kerberos v5).
* Requires J2SE 1.4, or JNDI 1.2 with ldapbp.jar, JAAS, JCE, an RFC 2853
* compliant implementation of J-GSS and a Kerberos v5 implementation.
* Jaas.conf
* racfldap.GssExample {com.sun.security.auth.module.Krb5LoginModule required client=TRUE useTicketCache=true doNotPrompt=true; };
* 'qop' is a comma separated list of tokens, each of which is one of
* auth, auth-int, or auth-conf. If none is supplied, the default is 'auth'.
class KerberosExample {
public static void main(String[] args) {
java.util.Properties p = new java.util.Properties(System.getProperties());
p.setProperty("java.security.krb5.realm", "ISY");
p.setProperty("java.security.krb5.kdc", "192.168.0.101");
p.setProperty("java.security.auth.login.config", "C:\\jaas.conf");
System.setProperties(p);
// 1. Log in (to Kerberos)
LoginContext lc = null;
try {
lc = new LoginContext("ISY",
new TextCallbackHandler());
// Attempt authentication
lc.login();
} catch (LoginException le) {
System.err.println("Authentication attempt failed" + le);
System.exit(-1);
// 2. Perform JNDI work as logged in subject
Subject.doAs(lc.getSubject(), new LDAPAction(args));
// 3. Perform LDAP Action
* The application must supply a PrivilegedAction that is to be run
* inside a Subject.doAs() or Subject.doAsPrivileged().
class LDAPAction implements java.security.PrivilegedAction {
private String[] args;
private static String[] sAttrIDs;
private static String sUserAccount = new String("Administrator");
public LDAPAction(String[] origArgs) {
this.args = (String[])origArgs.clone();
public Object run() {
performLDAPOperation(args);
return null;
private static void performLDAPOperation(String[] args) {
// Set up environment for creating initial context
Hashtable env = new Hashtable(11);
env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.ldap.LdapCtxFactory");
// Must use fully qualified hostname
env.put(Context.PROVIDER_URL, "ldap://192.168.0.101:389/DC=isy,DC=local");
// Request the use of the "GSSAPI" SASL mechanism
// Authenticate by using already established Kerberos credentials
env.put(Context.SECURITY_AUTHENTICATION, "GSSAPI");
env.put("javax.security.sasl.server.authentication", "true");
try {
/* Create initial context */
DirContext ctx = new InitialDirContext(env);
/* Get the attributes requested */
Attributes aAnswer =ctx.getAttributes( "CN="+ sUserAccount + ",CN=Users,DC=isy,DC=local");
NamingEnumeration enumUserInfo = aAnswer.getAll();
while(enumUserInfo.hasMoreElements()) {
System.out.println(enumUserInfo.nextElement().toString());
// Close the context when we're done
ctx.close();
} catch (NamingException e) {
e.printStackTrace();
}JAAS conf file is :
ISY {
     com.sun.security.auth.module.Krb5LoginModule required
debug=true;
};krb5.ini file is :
# Kerberos 5 Configuration File
# All available options are specified in the Kerberos System Administrator's Guide. Very
# few are used here.
# Determines which Kerberos realm a machine should be in, given its domain name. This is
# especially important when obtaining AFS tokens - in afsdcell.ini in the Windows directory
# there should be an entry for your AFS cell name, followed by a list of IP addresses, and,
# after a # symbol, the name of the server corresponding to each IP address.
[libdefaults]
     default_realm = ISY
[domain_realm]
     .isy.local = ISY
     isy.local = ISY
# Specifies all the server information for each realm.
#[realms]
     ISY=
          kdc = 192.168.0.101
          admin_server = 192.168.0.101
          default_domain = ISY
     }

Now it works
i will try to explain how i do this :
step 1 )
fallow this guide http://www.cit.cornell.edu/computer/system/win2000/kerberos/
and configure AD to use kerberos and to heve Kerberos REALM
step 2 ) try windows login to the new realm to be sure that it works ADD trusted realm if needed.
step 3 ) create jaas.conf file for example in c:\
it looks like this :
ISY {
     com.sun.security.auth.module.Krb5LoginModule required
debug=true;
};step 4)
( dont forget to make mappings which are explained in step 1 ) go to Active Directory users make sure from View to check Advanced Features Right click on the user go to mappings in secound tab kerberos mapping add USERNAME@KERBEROSreaLm for example [email protected]
step 5)
copy+paste this code and HIT RUN :)
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.security.auth.Subject;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import com.sun.security.auth.callback.TextCallbackHandler;
public class Main {
    public static void main(String[] args) {
    java.util.Properties p = new java.util.Properties(System.getProperties());
    p.setProperty("java.security.krb5.realm", "ISY.LOCAL");
    p.setProperty("java.security.krb5.kdc", "192.168.0.101");
    p.setProperty("java.security.auth.login.config", "C:\\jaas.conf");
    System.setProperties(p);
    // 1. Log in (to Kerberos)
    LoginContext lc = null;
    try {
            lc = new LoginContext("ISY", new TextCallbackHandler());
    // Attempt authentication
    lc.login();
    } catch (LoginException le) {
    System.err.println("Authentication attempt failed" + le);
    System.exit(-1);
    // 2. Perform JNDI work as logged in subject
    Subject.doAs(lc.getSubject(), new LDAPAction(args));
    // 3. Perform LDAP Action
    * The application must supply a PrivilegedAction that is to be run
    * inside a Subject.doAs() or Subject.doAsPrivileged().
    class LDAPAction implements java.security.PrivilegedAction {
    private String[] args;
    private static String[] sAttrIDs;
    private static String sUserAccount = new String("Administrator");
    public LDAPAction(String[] origArgs) {
    this.args = origArgs.clone();
    public Object run() {
    performLDAPOperation(args);
    return null;
    private static void performLDAPOperation(String[] args) {
    // Set up environment for creating initial context
    Hashtable env = new Hashtable(11);
    env.put(Context.INITIAL_CONTEXT_FACTORY,
    "com.sun.jndi.ldap.LdapCtxFactory");
    // Must use fully qualified hostname
    env.put(Context.PROVIDER_URL, "ldap://192.168.0.101:389");
    // Request the use of the "GSSAPI" SASL mechanism
    // Authenticate by using already established Kerberos credentials
    env.put(Context.SECURITY_AUTHENTICATION, "GSSAPI");
//    env.put("javax.security.sasl.server.authentication", "true");
    try {
    /* Create initial context */
    DirContext ctx = new InitialDirContext(env);
    /* Get the attributes requested */
    //Create the search controls
    SearchControls searchCtls = new SearchControls();
    //Specify the attributes to return
    String returnedAtts[]={"sn","givenName","mail"};
    searchCtls.setReturningAttributes(returnedAtts);
    //Specify the search scope
    searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);
    //specify the LDAP search filter
    String searchFilter = "(&(objectClass=user)(mail=*))";
    //Specify the Base for the search
    String searchBase = "DC=isy,DC=local";
    //initialize counter to total the results
    int totalResults = 0;
    // Search for objects using the filter
    NamingEnumeration answer = ctx.search(searchBase, searchFilter, searchCtls);
    //Loop through the search results
    while (answer.hasMoreElements()) {
            SearchResult sr = (SearchResult)answer.next();
        totalResults++;
        System.out.println(">>>" + sr.getName());
        // Print out some of the attributes, catch the exception if the attributes have no values
        Attributes attrs = sr.getAttributes();
        if (attrs != null) {
            try {
            System.out.println("   surname: " + attrs.get("sn").get());
            System.out.println("   firstname: " + attrs.get("givenName").get());
            System.out.println("   mail: " + attrs.get("mail").get());
            catch (NullPointerException e)    {
            System.err.println("Error listing attributes: " + e);
    System.out.println("RABOTIII");
        System.out.println("Total results: " + totalResults);
    ctx.close();
    } catch (NamingException e) {
    e.printStackTrace();
}It will ask for username and password
type for example : [email protected] for username
and password : TheSecretPassword
where ISY.LOCAL is the name of kerberos realm.
p.s. it is not good idea to use Administrator as login :)
Edited by: JOKe on Sep 14, 2007 2:23 PM

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Trying to use wireless N with iwlwifi & network manager

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