diff --git a/doc/bug_analysis.md b/doc/bug_analysis.md
index a7e1e9b..fde13f6 100644
--- a/doc/bug_analysis.md
+++ b/doc/bug_analysis.md
@@ -1,6 +1,18 @@
 # Open issues
 
-## Issue 18: On SuperCharger we ignore the session ID
+## Issue21: Missing fields in ChargeParameterDiscoveryReq
+- In the ChargeParameterDiscoveryReq, some fields are not filled. This leads to abort on certain charger types.
+- Discussion in https://openinverter.org/forum/viewtopic.php?p=54696#p54696
+- Improvement in https://github.com/uhi22/OpenV2Gx/commit/4b5df391d56e15b45652605fa7ad8a7712e2acaf
+
+## Issue19: Wrong determination of MAC and IPv6
+- On linux, the deprecated ifconfig is not a good choice. And, if multiple interfaces are present, the wrong address is fetched.
+- Solution: Three parts
+1. Use "ip addr" instead of "ifconfig" -> done
+2. Filter for the correct interface -> done
+3. Make the interface name configurable -> todo
+
+## Issue18: On SuperCharger we ignore the session ID
 - In the SessionSetupResponse, the SuperCharger V3 correctly provides a sessionID, e.g. "06ef0071".
 - But we ignore this, and send in all next messages (starting with ServiceDiscoveryReq) the sessionID "deadbeefdeadbeef".
 - The SuperCharger correctly complains with "ResponseCode": "FAILED_UnknownSession".
@@ -14,8 +26,7 @@ use a dynamic length instead of the fixed length LEN_OF_SESSION_ID (=8).
 - implementation done with https://github.com/uhi22/OpenV2Gx/commit/9c08c19ce14446a316ed4059d6d5b5e07721fd9d
 - to be tested.
 
-
-## Issue 17: Welding detection fails
+## Issue17: Welding detection fails
 - WeldingDetectionRes says "failed" on alpitronics, and no response on ABBHPC and ABBTriple
 - version v0.4-7-g7cea8b5 (2022-12-21)
 
@@ -28,6 +39,11 @@ and after one second the state machine seems to run into timeout.
 
 # Closed issues
 
+## [Solved] Issue20: Missing EVCCID in the SessionSetupReq
+- In the SessionSetupReq, the charger expects the EVCCID filled with the cars MAC. This is missing, and leads to abort on certain charger types.
+- Discussion in https://openinverter.org/forum/viewtopic.php?p=54667#p54667
+- Fixed with https://github.com/uhi22/OpenV2Gx/commit/fc46c3ca802f08c57120a308f69fb4d1ce14f6b6 and https://github.com/uhi22/pyPLC/commit/9b39bff85a04071e5d92d613197422033f0c1d8d
+
 ## [Solved] Issue16: First CurrentDemandReq is rejected with FAILED_SequenceError and EVSE_Shutdown
 - observed on Alpitronics HPC with version v0.4-6-g257e5af
 - log 2022-12-20_alpi_currentDemandSequenceErrorShutdown.pcapng