Does anyone have any experience with a bridged APN on Open5GS? David
Hi David, On Mon, Apr 06, 2020 at 04:29:21PM -0400, david@ispsupplies.com wrote:
Does anyone have any experience with a bridged APN on Open5GS?
As far as I know, 3GPP didn't really introduce "Ethernet" type PDN contexts until very recent releases. For a long time, IPv4, IPv6 and IPv4v6 were the only available options. I would be surprised if Open5GS supports non-IP PDN context types yet. But of course, it could be implemented in the pgw. Out of curiousity: Is this a service you are already able to get from commercial / public mobile operators? Regards, Harald -- - Harald Welte <laforge@osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
The Druid EPC supports it but it's pretty pricey. Most of the UE now support bridged APN but I don't know how exactly. David Peterson Senior Engineer 855-947-7776 ext. 9214 c 419-706-7355 d 979-314-1305 https://www.ispsupplies.com -----Original Message----- From: Harald Welte <laforge@osmocom.org> Sent: Tuesday, April 7, 2020 12:18 PM To: david@ispsupplies.com Cc: nextepc@lists.osmocom.org Subject: Re: Bridged APN Hi David, On Mon, Apr 06, 2020 at 04:29:21PM -0400, david@ispsupplies.com wrote:
Does anyone have any experience with a bridged APN on Open5GS?
As far as I know, 3GPP didn't really introduce "Ethernet" type PDN contexts until very recent releases. For a long time, IPv4, IPv6 and IPv4v6 were the only available options. I would be surprised if Open5GS supports non-IP PDN context types yet. But of course, it could be implemented in the pgw. Out of curiousity: Is this a service you are already able to get from commercial / public mobile operators? Regards, Harald -- - Harald Welte <laforge@osmocom.org> https://linkprotect.cudasvc.com/url?a=http%3a%2f%2flaforge.gnumonks.org%2f&c =E,1,V3ywxDXXH4chv9NsJa4rDUER9Dad7xDLiL8Hi65mO1uEwaTryrvyLz7IJwz0FEOtt_hrk9Q Jverxf1ouK0sHaN0Uie4v_5ezMnhS4RQaX3GSMKk2qdM,&typo=1 ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
Hi David, On Tue, Apr 07, 2020 at 06:18:23PM +0200, Harald Welte wrote:
On Mon, Apr 06, 2020 at 04:29:21PM -0400, david@ispsupplies.com wrote:
Does anyone have any experience with a bridged APN on Open5GS?
As far as I know, 3GPP didn't really introduce "Ethernet" type PDN contexts until very recent releases. For a long time, IPv4, IPv6 and IPv4v6 were the only available options.
I just checked: Etehernet type PDN connections are only supported in 5G, but not in 4G/EPC. Even Releae 15 doesn't mention it at all. So whatever some vendors may be offering, I would bet it is not really any actual Ethernet bridging. It may be more something like proxy-ARP on the PGW side, but still only passing IP over the 4G network. The big question is: What is it used for, and what are the requirements of that use case? A real Ethernet bridge would be transparent regarding the MAC addresses on both sides. And that's what I'm stating is not possible over 4G as per 3GPP specs. -- - Harald Welte <laforge@osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
The reason this is something people want is that the UE in bridge mode can offer a public IP to a router behind the UE. I do agree that this is likely something very proprietary. A proxy-ARP would be good but I am not sure how that would work in the UE. David Peterson Senior Engineer 855-947-7776 ext. 9214 c 419-706-7355 d 979-314-1305 https://www.ispsupplies.com -----Original Message----- From: Harald Welte <laforge@osmocom.org> Sent: Tuesday, April 7, 2020 2:52 PM To: david@ispsupplies.com Cc: nextepc@lists.osmocom.org Subject: Re: Bridged APN Hi David, On Tue, Apr 07, 2020 at 06:18:23PM +0200, Harald Welte wrote:
On Mon, Apr 06, 2020 at 04:29:21PM -0400, david@ispsupplies.com wrote:
Does anyone have any experience with a bridged APN on Open5GS?
As far as I know, 3GPP didn't really introduce "Ethernet" type PDN contexts until very recent releases. For a long time, IPv4, IPv6 and IPv4v6 were the only available options.
I just checked: Etehernet type PDN connections are only supported in 5G, but not in 4G/EPC. Even Releae 15 doesn't mention it at all. So whatever some vendors may be offering, I would bet it is not really any actual Ethernet bridging. It may be more something like proxy-ARP on the PGW side, but still only passing IP over the 4G network. The big question is: What is it used for, and what are the requirements of that use case? A real Ethernet bridge would be transparent regarding the MAC addresses on both sides. And that's what I'm stating is not possible over 4G as per 3GPP specs. -- - Harald Welte <laforge@osmocom.org> https://linkprotect.cudasvc.com/url?a=http%3a%2f%2flaforge.gnumonks.org%2f&c =E,1,hNWtGbT4z6FpXSVPyJKcFjf3Z0KiFEs8jM-ieaMX3jUKxhJL6VV9DcaPN5fdRSrnNaVHR5G hVAve_eYEICjye1bCYOfis2a5-vfq2X4NJZr6S8viUCbMA4Q5bg,,&typo=1 ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
Hi David, On Tue, Apr 07, 2020 at 03:23:17PM -0400, david@ispsupplies.com wrote:
The reason this is something people want is that the UE in bridge mode can offer a public IP to a router behind the UE.
Normally I would have assumed that the router has a LTE modem/interface built-in, and hence the IP address of the PDP/PDN connection is local to the router. If you want to implement a UE that doesn't terminate the IP of the PDP/PDN connection, I would argue that this is a feature that can be implemented entirely on the UE side, without any need from the network side. Fundamentally, the point is that a 3GPP cellular network (before 5G) provides a point-to-point IP interface. There are no Ethernet frames, no MAC addresses, no broadcast domain, netmask, default gateway, etc. A point-to-point interface only has a local and a remote IP address. Think of the good old days of SLIP/PPP over dialup modems. Sure, you can invent all kinds of hacks like running a local DHCP server on the UE that hands out a single lease (which is the address allocated by the P-GW/GGSN), but they are probably even more ugly hacks than to implement stateless bi-directional 1:1 address translation in the UE. In any case, I still don't see what the EPC could or should do in any of this. Regards, Harald -- - Harald Welte <laforge@osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
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