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Harald Welte laforge at osmocom.orgHi David, On Tue, Apr 07, 2020 at 03:23:17PM -0400, david at 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 at osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)