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Obsolete:Resolving Conflicting LDAP Port

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Both IPA and Samba are providing LDAP services on port 389. If installed on the same machine, these services will conflict with each other. To solve this problem, the machine must have multiple IP addresses, then the services must bind to different addresses.

Configuring IPA

IPA can listen to a specific address by specifying the nsslapd-listenhost parameter:

dn: cn=config
nsslapd-listenhost: ipa.example.com
nsslapd-port: 389
nsslapd-securelistenhost: ipa.example.com
nsslapd-secureport: 636

Note that IPA can only listen to one IP address.

The socket is created in ldap/servers/slapd/main.c and ldap/servers/slapd/daemon.c:

int main(int argc, char **argv) {

    // get port
    n_port = config_get_port();
    ports_info.n_port = (unsigned short)n_port;

    // get listen address     
    slapd_listenhost2addr(config_get_listenhost(), &ports_info.n_listenaddr);

    // create sockets


int daemon_pre_setuid_init(daemon_ports_t *ports) {

    // create sockets
    ports->n_socket = createprlistensockets(ports->n_port, ports->n_listenaddr, 0, 0);

void slapd_daemon(daemon_ports_t *ports) {

    // get sockets
    n_tcps = ports->n_socket;

    // iterate through each socket
    for (fdesp = n_tcps; fdesp && *fdesp; fdesp++) {

        // listen to socket
        PR_Listen(*fdesp, DAEMON_LISTEN_SIZE);

Configuring Samba

Samba services can listen to specific interfaces only by adding the following parameters in smb.conf:

    interfaces           = eth1, eth4
    bind interfaces only = Yes

Note that the port number is not configurable. Each interface corresponds to one IP address.

The socket is created in source4/ldap_server/ldap_server.c:

NTSTATUS server_service_ldap_init() {
    return register_server_service("ldap", ldapsrv_task_init);

static void ldapsrv_task_init(struct task_server *task) {

    // if "interfaces" and "bind interfaces only" are defined
    if (lp_interfaces(task->lp_ctx) && lp_bind_interfaces_only(task->lp_ctx)) {

        // load interfaces
        load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
        num_interfaces = iface_count(ifaces);

        // iterate through each interface
        for(i = 0; i < num_interfaces; i++) {

            // get interface address
            const char *address = iface_n_ip(ifaces, i);

            // listen to address
            status = add_socket(task->event_ctx, task->lp_ctx, model_ops,
                address, ldap_service);

Creating Virtual IP Address

Make sure the machine has an network interface with a static IP address. Create a new network interface as its child:

% cd /etc/sysconfig/network-scripts
% cp ifcfg-eth0 ifcfg-eth0:0

Edit ifcfg-eth0:0:

IPADDR=<new IP address>

Restart networking service:

% service network restart