[Serusers] Multihomed SER & NAT

[Sebastian Gabris]

After reading a bit more mails, I came to two possible problems:

1. fix_nated_contact() needs a registrar to work properly
    I dont use a registrar, since i register at the VoIP - Provider.

or

2.  fix_nated_contact() is not ment to be used on this scenario

Any ideas on this?

Sebastian
> Hi everybody,
> 
> need some help on nattraversal.
> 
> i use a multihomed SER, one private IP & one public IP.
> 
> MyUA(privateIP) <-> (privateIP)SER(publicIP) <-> UA-(VoIP - Provider, pubicIP)
> 
> If i try to make a call from private net to public net, SER doesnt change the contact address. He changes the sdp - connection field but he, puts in the wrong IP - address.
> Instead o writing down his public IP, SER writes his private IP.
> Then SER forwards the call on his public interface to the provider, which will get wrong Contact & SDP information.
> 
> After reviewing my logs i saw that SER does the nat_uac_test, but the fix_nat_contact & fix_sdp dont work dont do what they should do :)
> 
>   Here are the important bits of my config:
>   
> fork=yes
> log_stderror=no 
> 
> mhomed=1
> listen=10.x.x.x
> listen=193.x.x.x
> 
> loadmodule "/usr/lib/ser/modules/nathelper.so"
> modparam("usrloc", "db_mode",   0)
> 
> 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
> 
>  if (nat_uac_test("3")) {
> 
>                 if (method == "REGISTER" || ! search("^Record-Route:")) {
>                     log(2,"LOG: Someone trying to register from private IP, rewriting\n");             
> 
>                     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(6);    # Mark as NATed
>                 };
>         };
> 
> ... and so on.
> 
> 
> 
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