29 Apr
2024
29 Apr
'24
1:13 p.m.
Hi Gang
Somehow I don't get my head around NAT Flags and the nathelper module
https://www.kamailio.org/docs/modules/5.7.x/modules/nathelper.html
In the examples I found, there is: FLT_NATS and FLB_NATB
If I got it right, FLB_NATB is a branch flag, which shall indicate that
the device is 'B'ehind NAT, right?
It is being set, when FLT_NATS is set:
if(isflagset(FLT_NATS)) {
setbflag(FLB_NATB);
}
But when should FLT_NATS be set and what is it's meaning? The examples I
found don't tell me this.
Mit freundlichen Grüssen
-Benoît Panizzon-
--
I m p r o W a r e A G - Leiter Commerce Kunden
______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
______________________________________________________
29 Apr
29 Apr
3:41 p.m.
I wouldn't worry too much about these. They're kind of an anachronism.
On Apr 29, 2024, at 6:13 AM, Benoit Panizzon via
sr-users <sr-users(a)lists.kamailio.org> wrote:
Hi Gang
Somehow I don't get my head around NAT Flags and the nathelper module
https://www.kamailio.org/docs/modules/5.7.x/modules/nathelper.html
In the examples I found, there is: FLT_NATS and FLB_NATB
If I got it right, FLB_NATB is a branch flag, which shall indicate that
the device is 'B'ehind NAT, right?
It is being set, when FLT_NATS is set:
if(isflagset(FLT_NATS)) {
setbflag(FLB_NATB);
}
But when should FLT_NATS be set and what is it's meaning? The examples I
found don't tell me this.
Mit freundlichen Grüssen
-Benoît Panizzon-
--
I m p r o W a r e A G - Leiter Commerce Kunden
______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
______________________________________________________
__________________________________________________________
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Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800
4:17 p.m.
Hi Alex
I wouldn't worry too much about these. They're
kind of an anachronism.
I just stumbled over your article:
https://www.cnblogs.com/shunzh/p/14360712.html
This helps a bit. After looking again at the issue I observe, I think I
have narrowed it down on the alias not being set on the replies.
So a 200 OK from a CPE behind nat, has a contact pointing to the IP
behind nat. Thus an ACK to that 200 OK is being routed to the IP behind
NAT.
I will keep digging into this and probably just have to get rid of
trying to understand how the NAT flags are being used in those examples
I found earlier.
Mit freundlichen Grüssen
-Benoît Panizzon-
--
I m p r o W a r e A G - Leiter Commerce Kunden
______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
______________________________________________________
4:19 p.m.
I had no idea the Chinese syndicated my article:
https://www.cnblogs.com/shunzh/p/14360712.html
Ah well.
Yeah, just use set_contact_alias() / handle_ruri_alias(). These flags are unnecessary and
a source of much confusion.
On Apr 29, 2024, at 9:17 AM, Benoit Panizzon
<benoit.panizzon(a)imp.ch> wrote:
Hi Alex
--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800
I wouldn't worry too much about these.
They're kind of an anachronism.
I just stumbled over your article:
https://www.cnblogs.com/shunzh/p/14360712.html
This helps a bit. After looking again at the issue I observe, I think I
have narrowed it down on the alias not being set on the replies.
So a 200 OK from a CPE behind nat, has a contact pointing to the IP
behind nat. Thus an ACK to that 200 OK is being routed to the IP behind
NAT.
I will keep digging into this and probably just have to get rid of
trying to understand how the NAT flags are being used in those examples
I found earlier.
Mit freundlichen Grüssen
-Benoît Panizzon-
--
I m p r o W a r e A G - Leiter Commerce Kunden
______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
______________________________________________________ 
6:19 p.m.
Hello,
FLT_NATS - NAT source (source behind NAT)
FLB_NATB - NAT branch (usrloc destination behind NAT)
As Alex mentioned, there are different ways to do NAT handling. Some people prefer the
manual approach as done in the kamailio default configuration, some (more) people nowadays
just to it in all cases and not differentiate that much anymore.
Cheers,
Henning
--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com
-----Original Message-----
From: Benoit Panizzon via sr-users <sr-users(a)lists.kamailio.org>
Sent: Montag, 29. April 2024 12:13
To: sr-users(a)lists.kamailio.org
Cc: Benoit Panizzon <benoit.panizzon(a)imp.ch>
Subject: [SR-Users] Understanding NAT Flags
Hi Gang
Somehow I don't get my head around NAT Flags and the nathelper module
https://www.kamailio.org/docs/modules/5.7.x/modules/nathelper.html
In the examples I found, there is: FLT_NATS and FLB_NATB
If I got it right, FLB_NATB is a branch flag, which shall indicate that the device is
'B'ehind NAT, right?
It is being set, when FLT_NATS is set:
if(isflagset(FLT_NATS)) {
setbflag(FLB_NATB);
}
But when should FLT_NATS be set and what is it's meaning? The examples I
found don't tell me this.
Mit freundlichen Grüssen
-Benoît Panizzon-
--
I m p r o W a r e A G - Leiter Commerce Kunden
______________________________________________________
Zurlindenstrasse 29 Tel +41 61 826 93 00
CH-4133 Pratteln Fax +41 61 826 93 01
Schweiz Web http://www.imp.ch
______________________________________________________
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions To unsubscribe
send an email to sr-users-leave(a)lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to the
sender!
Edit mailing list options or unsubscribe:
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4 comments
3 participants
participants (3)
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Alex Balashov -
Benoit Panizzon -
Henning Westerholt