[SR-Users] Loop detected on aws setup
Daniel-Constantin Mierla
miconda at gmail.com
Fri Oct 18 09:30:57 CEST 2013
Hello,
for reference, in case kamailio is running behind nat, like on AWS, one
should just use advertise directive for listen parameter, like:
listen=proto:privateip:port advertise publicip:port
See:
http://www.kamailio.org/wiki/cookbooks/4.0.x/core#listen
It simplifies the config by not needing to use alias parameter,
advertised_address/set_addvertised_address() and record_route_preset().
Cheers,
Daniel
On 10/18/13 8:23 AM, Klaus Darilion wrote:
>
>
> On 17.10.2013 17:31, julian arsanches wrote:
>> Hi all, before hand thanks for all the support received on this channel.
>>
>> I have an issue with an installed server on a aws instance which is
>> giving me routing loops, my setup is simple, i have alias set for both
>> ips internal and external and the loop still present when t_relay don't
>> find any routes to relay it just sent it to itself with the public ip
>> then the loop starts.
>>
>> can any one please advise how can i prevent that or just tell t_relay
>> that if there is no more routes just respond with a cancel or stop
>> searching.
>
> If you call t_relay, then the message will be forwarded to $ru (or to
> $du if $du is set). t_relay itself does not have any logic inside.
>
> Thus, if you do not want a message to be forwarded, then you must not
> call t_relay.
>
> If you do not want to send a message to a certain destination, then
> set $ru (the domain part) to the respective destination.
>
> One issue may be the aliases. If Kamailio thinks that it is not
> authoritative for a domain, then it forwards the message to the
> domain. Kamailio by default feels authoritative for the IP addresses
> on which it listens (the private IP addresses). Thus if a request is
> received by Kamailio, but the RURI (request URI, $ru) indicated the
> public IP address, KAmailio by default forwards the message to the
> respective RURI (which my be forward again by AWS NAT to Kamailio).
>
> Thus, alias=public.ip.addr.ess must be added to the config.
>
> If there are still problems you have set debug=4 and track in the log
> file how the message is processed, and where the routing decision
> takes the wrong direction.
>
> regards
> Klaus
>
>>
>> same thing happens when a gw code is not found on the dispatcher list
>> file.
>>
>> as i had read by just specifying the alias=domain it should take care of
>> it but it is not happening perhaps because it is a AWS instance, or most
>> likely i am missing something after the T_relay to stop the call from
>> looping.
>>
>> I do have several headers fix because i have an asterisk sending calls
>> with lots of signalling calls added to the call that i need to remove
>> before the call is passed out to a carrier or another UA, Kamailio is
>> just proxing the calls between asterisk and the outside world no Media
>> handling, No registrations.
>>
>> Again thanks for any tips to find my answer or if anyone had a similar
>> issue thanks again.
>>
>> thanks for any help .
>>
>> Julian.
>>
>> on this setup i have
>>
>> public ip as 2.2.2.2
>>
>> private IP as 1.1.1.1
>>
>>
>> #!KAMAILIO
>> ####### Global Parameters #########
>>
>> #!ifdef WITH_DEBUG
>> debug=4
>> log_stderror=yes
>> #!else
>> #debug=2
>> #log_stderror=yes
>> #!endif
>>
>> memdbg=5
>> memlog=5
>>
>> log_facility=LOG_LOCAL7
>>
>> fork=yes
>> children=6
>>
>> auto_aliases=no
>>
>>
>> listen=udp:1.1.1.1:5060 <http://1.1.1.1:5060> advertise 2.2.2.2:5060
>> <http://2.2.2.2:5060>
>>
>> alias=1.1.1.1:5060 <http://1.1.1.1:5060>
>> alias=1.1.1.1
>> alias=2.2.2.2:5060 <http://2.2.2.2:5060>
>> alias=2.2.2.2
>>
>>
>> port=5060
>>
>> enable_tls=no
>>
>> #tcp_connection_lifetime=3605
>>
>> #!ifdef WITH_SRCPATH
>> mpath="modules_k:modules"
>> #!else
>> mpath="/usr/lib64/kamailio/modules_k/:/usr/lib64/kamailio/modules/"
>>
>> #!endif
>> loadmodule "db_mysql.so"
>> ##loadmodule "mi_fifo.so"
>> loadmodule "tm.so"
>> loadmodule "sl.so"
>> loadmodule "acc.so"
>> loadmodule "rr.so"
>> loadmodule "maxfwd.so"
>> loadmodule "uac.so"
>> loadmodule "textops.so"
>> loadmodule "pv.so"
>> loadmodule "dispatcher.so"
>> loadmodule "usrloc.so"
>> loadmodule "registrar.so"
>> loadmodule "siputils.so"
>> loadmodule "sanity.so"
>> loadmodule "ctl.so"
>> loadmodule "mi_rpc.so"
>> loadmodule "avpops.so"
>> #!ifdef WITH_NAT
>> loadmodule "nathelper.so"
>> loadmodule "rtpproxy.so"
>> #!endif
>> loadmodule "xlog.so"
>> ##mysqlcdr
>> modparam("acc", "db_flag", 2)
>> modparam("acc", "db_missed_flag", 3)
>> modparam("acc", "report_cancels", 1)
>> modparam("acc", "db_url", "mysql://openser:password@1.1.1.2/openser
>> <http://openser:password@1.1.1.2/openser>")
>> modparam("acc", "db_extra", "from_uri=$fu; to_uri=$tu; intid=$fU;
>> type_call=$si; dst_ip=$ru; carriercode=$tu;callmode=$var(out)" )
>>
>> #loadmodule "carrierroute"
>> modparam("tm", "cancel_b_method", 1)
>> modparam("tm", "failure_reply_mode", 3)
>> modparam("tm", "fr_timer", 30000)
>> modparam("tm", "fr_inv_timer", 120000)
>>
>> modparam("dispatcher", "list_file", "/etc/kamailio/dispatcher.lst")
>> modparam("rr", "enable_full_lr", 1)
>>
>> #!ifdef WITH_NAT
>> # ----- rtpproxy params -----
>> modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:7722
>> <http://127.0.0.1:7722>")
>>
>> # ----- nathelper params -----
>> modparam("nathelper", "natping_interval", 30)
>> modparam("nathelper", "ping_nated_only", 1)
>> modparam("nathelper", "sipping_bflag", FLB_NATSIPPING)
>> modparam("nathelper", "sipping_from", "sip:pinger at kamailio.org
>> <mailto:sip%3Apinger at kamailio.org>")
>> # ----- mi_fifo params -----
>>
>> ##modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo")
>>
>> # params needed for NAT traversal in other modules
>> modparam("nathelper|registrar", "received_avp", "$avp(RECEIVED)")
>> modparam("usrloc", "nat_bflag", FLB_NATB)
>> #!endif
>> modparam("xlog", "buf_size", 8192)
>> modparam("xlog", "force_color", 1)
>> #carrierroute
>> #modparam("carrierroute", "config_file",
>> "/etc/kamailio/carrierroute.conf")
>> #end carrierroute
>>
>> modparam("pv", "shvset", "ruta=s:$ru")
>> modparam("pv", "varset","in=s:IN")
>> modparam("pv", "varset","out=s:OUT")
>> #################BEGINING MAINROUTE##################
>> request_route {
>>
>> if (!mf_process_maxfwd_header("4")) {
>> sl_send_reply("483","Too Many Hops");
>> drop;
>> exit;
>> }
>> ##
>> # initial sanity checks -- too long messages
>> if (msg:len >= 2048 ) {
>> sl_send_reply("513", "Message too big");
>> xlog("out header CHECK 513 baderror from_uri=$fu;($ct++)<$tU---=$var(n)>
>> to_uri=$tu; intid=$fU; type_call=$si; dst_ip=$ru;
>> carriercode=$var(z);callmode=$var(out)");
>> drop;
>> exit;
>> };
>> #
>> if(is_method("OPTIONS")) {
>> # send reply for each options request
>> sl_send_reply("200", "ok");
>> exit();
>> }
>>
>>
>>
>> #
>> if ( is_method("ACK") ) {
>> if ( t_check_trans() ) {
>> # no loose-route, but stateful ACK;
>> # must be an ACK after a 487
>> # or e.g. 404 from upstream server
>> $var(n)=$(tU{s.substr,3,0});
>> $var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(r)=$rd; ##to domain
>> $fU=$(fU{s.substr,14,0});
>> $fn=$var(t);
>> $tU=$var(n);
>> $td=$var(r);
>>
>> subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');
>>
>> # Remove prefixes numbers from Contact\
>> t_relay();
>> exit;
>> } else {
>> # ACK without matching transaction ... ignore and discard
>> $var(n)=$(tU{s.substr,3,0});
>> $var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(r)=$rd; ##to domain
>> $fU=$(fU{s.substr,14,0});
>> $fn=$var(t);
>> $tU=$var(n);
>> $td=$var(r);
>>
>> subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');
>> t_relay();
>> exit;
>> }
>> }
>> ##responding to bye requests and modifying headers to match invite
>> if(method=="BYE") {
>> #Account BYE transactions
>> #$var(d) = $tu;
>> #$var(e)=$(var(d){s.substr,4,3});
>> setflag(2);
>> setflag(10);
>> $var(n)=$(tU{s.substr,3,0});
>> $var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(r)=$rd; ##to domain
>> $fU=$(fU{s.substr,14,0});
>> $fn=$var(t);
>> $tU=$var(n);
>> $td=$var(r);
>>
>> subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');
>> t_relay();
>> exit;
>> };
>>
>> #CANCEL processing
>> if (method=="CANCEL") {
>> setflag(2);
>> setflag(3);
>> $var(n)=$(tU{s.substr,3,0});
>> $var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(r)=$rd; ##to domain
>> $fU=$(fU{s.substr,14,0});
>> $fn=$var(t);
>> $tU=$var(n);
>> $td=$var(r);
>>
>> subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');
>> t_relay();
>> exit;
>> ##if (t_check_trans()) t_relay();
>>
>> exit;
>> };
>>
>>
>> #
>>
>>
>> #
>> if (loose_route()) {
>>
>>
>> ##
>> if(is_method("OPTIONS")) {
>> # send reply for each options request
>> sl_send_reply("200", "ok");
>> exit();
>> }
>> ##
>> if(method=="BYE") {
>> #Account BYE transactions
>> setflag(2);
>> };
>>
>>
>> ##CANCEL processing
>> if (method=="CANCEL") {
>> setflag(3);
>> $var(n)=$(tU{s.substr,3,0});
>> $var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});
>>
>> $var(r)=$rd; ##to domain
>> $fU=$(fU{s.substr,14,0});
>> $fn=$var(t);
>> $tU=$var(n);
>> $td=$var(r);
>> subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');
>> if (t_check_trans()) t_relay();
>> exit;
>> };
>>
>> if (!t_relay()) {
>> sl_reply_error();
>> }
>> exit;
>> }
>>
>>
>> if (is_method("INVITE")) { #Procesing invites
>>
>>
>> record_route();
>> }
>> ##LOGGING CALL BEFORE IS PROCESSED
>> xlog("before strip,< time [$Tf] > Aip= $src_ip, r-uri($ru\n");
>> xlog("before from_uri=$fu; to_uri=$tu; pai=<<$ct>>;intid=$fU;
>> type_call=$si; dst_ip=$ru; carriercode=$tu;callmode=$var(out)
>> --$$--$ou");
>> #creando rutas
>> setflag(2);
>> # Account Missed calls
>> setflag(3);
>> ###VARIABLES FOR MODIFICATIONS
>> $var(x) = $(ru);
>>
>> $var(y)=$(var(x){s.substr,4,3});
>>
>> $var(z)=$(var(y){s.int <http://s.int>});
>>
>> $var(t)=$(var(x){s.substr,7,0});
>>
>> $var(h)=$(var(x){s.substr,0,7});
>>
>> $var(o)=$(fU{s.substr,14,0});
>>
>> if($(var(x){s.len}) < 3)
>> {
>> $var(z)='0'+ $var(z);
>> }
>>
>> xlog("dsroute $var(z)fullruri($ru)\n");
>>
>>
>> strip(3);
>>
>> xlog("after strip time [$Tf] method ($rm) via el code
>> ($var(z)--varhex($var(h))-- ($var(y))\n");
>> xlog("after from_uri=$fu; to_uri=$tu; intid=$fU; type_call=$si;
>> dst_ip=$ru; carriercode=$var(z);callmode=$var(out)");
>>
>> ds_select_domain ("$var(z)", "4");#carrer dynamic
>>
>>
>> ###########KILLING BUGGIES#######when t_realy fails to find a route a
>> loop is generate then strip takes off a digit until 0 at 2.2.2.2
>> <mailto:0 at 2.2.2.2> is left for to: user this kills that call.#####
>> if ($(tU{s.len}) < 4) {
>> xlog("CHECK TU 1bad kILLING BUGGIES>>> $tu--$td-$tU-$tt--$dd-$dd-$du-
>> -<<$rd>$ru --- $oU> pai+++ <<$ct>>++ from_uri=$fu;<$tU---=$var(n)>
>> to_uri=$tu; }pai<$ai> id=$fU; type_call=$si; dst_ip=$ru;
>> carriercode=$var(z);callmode=$var(out)");
>> ##sl_reply_error();
>> ##sl_send_reply("513", "Message too big");
>> ##sl_send_reply("488","Not Acceptable Here");
>> sl_send_reply("488","Not Acceptable Here");
>> #t_reset_retr();
>> #t_release();
>> ##if(!t_relay()){ sl_reply_error(); drop; exit;}
>>
>> #if (!t_relay()) { sl_reply_error(); break; };
>> # t_relay();
>> #setflag(2);
>> drop;
>> exit;
>>
>> }; ## Endif less than 4
>> ##############END KILLING###########
>> ################ROUTE SELECTION###############
>> if($(fn{s.len}) > 10) { # IF WE CHECK FOR FROM: ROUTEID MUST BE LONGER
>> THAN 10 DIGITS TO BE A VALID ROUTE
>>
>> xlog("out header CHECK more than 10 digits BEFORE
>> from_uri=$fu;($ct++)<$tU---=$var(n)> to_uri=$tu; intid=$fU;
>> type_call=$si; dst_ip=$ru; carriercode=$var(z);callmode=$var(out)");
>> $var(n)=$(tU{s.substr,3,0});
>> $var(i)=$(ct{re.subst,/^.*00700(.*)/"\1/});
>> $var(t)=$(fn{re.subst,/^.*00700(.*)/"\1/});
>> $var(r)=$rd; ##to domain
>> $fU=$(fU{s.substr,14,0});
>> $fn=$var(t);
>> $tU=$var(n);
>> $td=$var(r);
>>
>> subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig'); # Remove number
>> from Contact
>>
>> ##if(!t_relay()){ sl_reply_error(); drop; exit;}
>>
>> if (!t_relay()) { sl_reply_error(); break; };
>>
>> # t_relay();
>>
>> drop;
>> exit;
>>
>> };
>>
>> ################ENDrouteselect##############################
>>
>>
>> ###############AFTER LAST IF##############reply 488 ANY CALL THAT DID
>> NOT FOUND A ROUTE.
>> sl_send_reply("488","Not Acceptable Here");
>> drop;
>> exit;
>> }
>>
>> ###################END MAINROUTE#################
>>
>>
>>
>>
>>
>> On My dispatcher.lst i have
>>
>>
>> 1 sip:1.1.1.1:5060 <http://1.1.1.1:5060>
>> 2 sip:2.2.2.2:5060 <http://2.2.2.2:5060>
>> 3 sip:3.3.3.3:5060 <http://3.3.3.3:5060>
>> 3 sip:3.3.3.5:5060 <http://3.3.3.5:5060>
>> ...
>>
>>
>>
>>
>> _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>> sr-users at lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>
>
> _______________________________________________
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--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Trainings - Berlin, Nov 25-28; Miami, Nov 18-20, 2013
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