<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=us-ascii" http-equiv=Content-Type> <META name=GENERATOR content="MSHTML 11.00.10570.1001"></HEAD> <BODY> <DIV><FONT size=2 face=Arial> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial>I have a problem with ModemManager, but only when trying to get an IPv4 address when the network only supports IPv6 (Dual Stack, using IPv4v6).</FONT></SPAN></DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial>I have two different systems:</FONT></SPAN></DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial>- one running OpenWRT v19 and ModemManager v1.12.2 </FONT></SPAN></DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial>- the second system running OpenWRT v21 and ModemManager v1.16.2</FONT></SPAN></DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial>If I set both systems up the same (EE SIM, ipv4v6) then </FONT></SPAN></DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial>- the v19/v1.12.2 system will only obtain an IPv6 address. (IPv6 works correctly, but not IPv4)</FONT></SPAN></DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial>- the v21/v1.16.2 system will obtain both IPv4 and IPv6 addresses. (Both work correctly).</FONT></SPAN></DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial>If I put a SIM in the v19/v1.12.2 system that only supports IPv4 it gets an IPv4 address and works correctly.</FONT></SPAN></DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial></FONT></SPAN> </DIV> <DIV><SPAN class=347302113-26102022><FONT size=2 face=Arial>It seems that the Dual Stack IPv4 and IPv6 is not working on the older release of ModemManager (v1.12.2). Is there a difference between the two versions with regard to Dual Stack and is there something we need to include in v1.12.2 to make Dual Stack work and give us an IPv4 address as well as an IPv6 address?</FONT></SPAN></DIV> <DIV><FONT size=2 face=Arial></FONT> </DIV> <DIV align=left><SPAN class=195162614-30052017> <DIV><SPAN class=347302113-26102022></SPAN><FONT size=2 face=Arial>T<SPAN class=347302113-26102022>hanks in advance.</SPAN><BR></FONT></SPAN></FONT></DIV></DIV></DIV> <DIV align=left><SPAN class=195162614-30052017><FONT size=2 face=Arial> <DIV><FONT size=2 face=Arial>Regards <BR> <BR>Robin <BR></FONT></DIV></FONT></SPAN></DIV></BODY></HTML>