[Serusers] config for NAT/STUN
Jan Janak
jan at iptel.org
Mon Jun 7 10:36:06 CEST 2004
Could you post SIP message dumps made at the SER server ?
Jan.
On 06-06 18:40, Peter Boot wrote:
> I am having trouble with getting messaging between two SIP clients each
> behind difference NATs, each making connection to SER using STUN.
>
> The clients are reaching each other successfully for the INVITE, ACK,
> REQUEST BYE messaging but during the call the clients are attempting to
> reach each other on their private IPs ie IPs behind their NATs. Is there a
> config alteration that I should make to fix ? Or am I looking in the wrong
> place ?
>
> My ser.cfg is below, thanks in advance
>
> Peter
>
>
> # ----------- global configuration parameters ------------------------
>
> debug=7 # debug level (cmd line: -dddddddddd)
> fork=yes
> log_stderror=no # (cmd line: -E)
>
> # Uncomment these lines to enter debugging mode #fork=no #log_stderror=yes
>
>
> check_via=no # (cmd. line: -v)
> dns=no # (cmd. line: -r)
> rev_dns=no # (cmd. line: -R)
> port=5060
> children=4
> fifo="/tmp/ser_fifo"
>
> # ------------------ module loading ----------------------------------
>
> # Uncomment this if you want to use SQL database
> loadmodule "/usr/local/lib/ser/modules/mysql.so"
>
> loadmodule "/usr/local/lib/ser/modules/tm.so"
> loadmodule "/usr/local/lib/ser/modules/acc.so"
> loadmodule "/usr/local/lib/ser/modules/sl.so"
> loadmodule "/usr/local/lib/ser/modules/rr.so"
> loadmodule "/usr/local/lib/ser/modules/maxfwd.so"
> loadmodule "/usr/local/lib/ser/modules/usrloc.so"
> loadmodule "/usr/local/lib/ser/modules/registrar.so"
> loadmodule "/usr/local/lib/ser/modules/textops.so"
> loadmodule "/usr/local/lib/ser/modules/vm.so"
>
> # Uncomment this if you want digest authentication
> # mysql.so must be loaded !
> loadmodule "/usr/local/lib/ser/modules/auth.so"
> loadmodule "/usr/local/lib/ser/modules/auth_db.so"
>
>
> # Transaction Module Params
> modparam("tm", "fr_inv_timer", 90)
>
> # Acounting Module Params
>
> # set the reporting log level
> modparam("acc", "log_level", 1)
> # number of flag, which will be used for accounting; if a message is
> labeled with this flag, its completion status will be reported
> modparam("acc", "log_flag", 1)
>
> modparam("acc", "log_missed_flag", 2)
> modparam("acc", "db_url", "mysql://xxx:xxx@localhost/ser")
> modparam("acc", "db_flag", 11)
> modparam("acc", "db_missed_flag", 12)
> modparam("acc", "failed_transactions", 1)
>
>
>
> # !! Nathelper
> loadmodule "/usr/local/lib/ser/modules/nathelper.so"
>
> # ----------------- setting module-specific parameters ---------------
>
> # -- usrloc params --
>
> #modparam("usrloc", "db_mode", 0)
>
> # Uncomment this if you want to use SQL database
> # for persistent storage and comment the previous line
> modparam("usrloc", "db_mode", 2)
>
> # -- auth params --
> # Uncomment if you are using auth module
> #
> modparam("auth_db", "calculate_ha1", yes)
> #
> # If you set "calculate_ha1" parameter to yes (which true in this config),
> # uncomment also the following parameter)
> #
> modparam("auth_db", "password_column", "password")
>
> # -- rr params --
> # add value to ;lr param to make some broken UAs happy
> modparam("rr", "enable_full_lr", 1)
>
> # !! Nathelper
> modparam("registrar", "nat_flag", 6)
> modparam("nathelper", "natping_interval", 30) # Ping interval 30 s
> modparam("nathelper", "ping_nated_only", 1) # Ping only clients behind NAT
>
> # ------------------------- request routing logic -------------------
>
> # main routing logic
>
> route{
> /* ********* ROUTINE CHECKS ********************************** */
> # initial sanity checks -- messages with
> # max_forwards==0, or excessively long requests
> if (!mf_process_maxfwd_header("10")) {
> sl_send_reply("483","Too Many Hops");
> break;
> };
> if (msg:len >= max_len ) {
> sl_send_reply("513", "Message too big");
> break;
> };
>
> # Process record-routing
> #if (loose_route()) { t_relay(); break; };
>
> # labeled all transaction for accounting
> setflag(11);
>
> # record-route INVITES to make sure BYEs will visit our server too
> if (method=="INVITE") record_route();
>
> # forward the request statefuly now; (we need *stateful* forwarding,
> # because the stateful mode correlates requests with replies and
> # drops retranmissions; otherwise, we would have to report on
> # every single message received)
> /* if (!t_relay()) {
> sl_reply_error();
> break;
> };
> */
>
>
> # !! Nathelper
> # Special handling for NATed clients; first, NAT test is
> # executed: it looks for via!=received and RFC1918 addresses
> # in Contact (may fail if line-folding is used); also,
> # the received test should, if completed, should check all
> # vias for rpesence of received
> if (nat_uac_test("3")) {
> # Allow RR-ed requests, as these may indicate that
> # a NAT-enabled proxy takes care of it; unless it is
> # a REGISTER
>
> if (method == "REGISTER" || ! search("^Record-Route:")) {
> log("LOG: Someone trying to register from private IP,
> rewriting\n");
>
> # This will work only for user agents that support
> symmetric
> # communication. We tested quite many of them and
> majority is
> # smart enough to be symmetric. In some phones it takes
> a configuration
> # option. With Cisco 7960, it is called NAT_Enable=Yes,
> with kphone it is
> # called "symmetric media" and "symmetric signalling".
>
> fix_nated_contact(); # Rewrite contact with source IP of
> signalling
> if (method == "INVITE") {
> fix_nated_sdp("1"); # Add direction=active to SDP
> };
> force_rport(); # Add rport parameter to topmost Via
> setflag(11); # Mark as NATed
> };
> };
>
> # we record-route all messages -- to make sure that
> # subsequent messages will go through our proxy; that's
> # particularly good if upstream and downstream entities
> # use different transport protocol
> if (!method=="REGISTER") record_route();
>
> # subsequent messages withing a dialog should take the
> # path determined by record-routing
> if (loose_route()) {
> # mark routing logic in request
> append_hf("P-hint: rr-enforced\r\n");
> route(1);
> break;
> };
>
> if (!uri=~"xxx.com.au") {
> # mark routing logic in request
> append_hf("P-hint: outbound\r\n");
> route(1);
> break;
> };
>
> # if the request is for other domain use UsrLoc
> # (in case, it does not work, use the following command
> # with proper names and addresses in it)
> if (uri=~"xxx.com.au") {
>
> if (method=="REGISTER") {
>
> # Uncomment this if you want to use digest authentication
> if (!www_authorize("xxx.com.au", "subscriber")) {
> www_challenge("xxx.com.au", "0");
> break;
> };
>
> save("location");
> break;
> };
>
> lookup("aliases");
> if (!uri=~"xxx.com.au") {
> append_hf("P-hint: outbound alias\r\n");
> route(1);
> break;
> };
>
>
> # attempt handoff to PSTN
> ## This assumes that the caller is registered in our realm
> if (uri=~"^sip:[0-9]*@sip.xxx.com.au") {
> log("Forwarding to PSTN\n");
> t_relay_to_udp( "xxx.xxx.xxx.xxx", "xxx"); ## Our
> Cisco router
> break;
> };
>
>
> # native SIP destinations are handled using our USRLOC DB
> if (!lookup("location")) {
> sl_send_reply("404", "Not Foundx");
> break;
> };
> };
> append_hf("P-hint: usrloc applied\r\n");
> route(1);
> }
>
> route[1]
> {
> # !! Nathelper
> /* if (uri=~"[@:](192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)" &&
> !search("^Route:")){
> sl_send_reply("479", "We don't forward to private IP
> addresses");
> break;
> };
> */
>
> # if client or server know to be behind a NAT, enable relay
> if (isflagset(6)) {
> force_rtp_proxy();
> };
>
> # NAT processing of replies; apply to all transactions (for example,
> # re-INVITEs from public to private UA are hard to identify as
> # NATed at the moment of request processing); look at replies
> t_on_reply("1");
>
> # send it out now; use stateful forwarding as it works reliably
> # even for UDP2TCP
> if (!t_relay()) {
> sl_reply_error();
> };
> }
>
> # !! Nathelper
> onreply_route[1] {
> # NATed transaction ?
> if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") {
> fix_nated_contact();
> force_rtp_proxy();
> # otherwise, is it a transaction behind a NAT and we
> did not
> # know at time of request processing ? (RFC1918
> contacts)
> } else if (nat_uac_test("1")) {
> fix_nated_contact();
> };
> }
>
>
>
> ---
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