10 May
2016
10 May
'16
11:30 p.m.
We don't handle this from the kernel, this GTP-U
echo request is
passed up to userspace. The idea is to support any signaling message
from userspace, only G-PDU messages are handled from the kernel
itself. Openggsn has code to generate the Echo response for this.
I am not completely sure whats the reason behind it. A similar example would be to move
the handling of SCTP heartbeat messages from the SCTP stack to lets say the MME entity.
Maybe I am misunderstanding something, but I really don't see what is the reason
behind handling the echo requests in the GGSN instead of the gtp-u stack itself. Can
someone please shed some light on this one?
Regards,
Csaba
----- Eredeti üzenet -----
Feladó: "Pablo Neira Ayuso" <pablo(a)netfilter.org>
Címzett: "Sipos Csaba" <sipos.csaba(a)kvk.uni-obuda.hu>
Másolatot kap: "Harald Welte" <laforge(a)gnumonks.org>rg>,
openbsc(a)lists.osmocom.org
Elküldött üzenetek: Kedd, 2016. Május 10. 22:11:11
Tárgy: Re: [PATCH net-next] gtp: add initial driver for datapath of GPRS Tunneling
Protocol (GTP-U)
On Tue, May 10, 2016 at 09:31:53PM +0200, Sipos Csaba wrote:
Hi Pablo,
Thanks for the info!
Just went through the code, and wanted to ask if I am right that
this implementation does not support GTP-U echo request/reply yet?
I am asking because according to the specs. this is an optional
feature, but in practice there are quite a lot of ENB products that
require a response to the GTP-U Echo Req. they send, otherwise they
are not going to start forwarding any data on the GTP-U path. The
reason for this is that in practice the ENB is always connected to
more than one MME, and the only way for the ENB to know which SGW is
available is to send GTP-U echo requests to check the availability
of the service.
We don't handle this from the kernel, this GTP-U echo request is
passed up to userspace. The idea is to support any signaling message
from userspace, only G-PDU messages are handled from the kernel
itself. Openggsn has code to generate the Echo response for this.
Just noticed that the link for libgtpnl is not working
yet.
cgit is not working properly for some reason, but the repo can be
cloned via:
git clone git://git.osmocom.org/libgtpnl