d/changelog: add 2.6.6~sysmocom2

Related: SYS#6582
Related: https://github.com/open5gs/open5gs/pull/2920

debian/changelog

@@ -1,3 +1,9 @@
+open5gs (2.6.6~sysmocom2) unstable; urgency=medium
+
+  * Fix fixed-0 IPCP identifier in PCO ack
+
+ -- Oliver Smith <osmith@sysmocom.de>  Fri, 26 Jan 2024 16:53:27 +0100
+
 open5gs (2.6.6~sysmocom1) unstable; urgency=medium
 
   * Rebase on top of open5gs.git main of 2023-10-31

src/smf/context.c

@@ -2854,6 +2854,7 @@ int smf_pco_build(uint8_t *pco_buf, uint8_t *buffer, int length)
 
                 ogs_assert(num_of_ipcp <= OGS_PCO_MAX_NUM_OF_IPCP);
                 pco_ipcp[num_of_ipcp].code = 2; /* Code : Configuration Ack */
+                pco_ipcp[num_of_ipcp].identifier = ipcp->identifier; /* ID: Needs to match request */
 
                 out_len = 4;
                 /* Primary DNS Server IP Address */