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--- notiz:dual-stack-lite-linux [2025/11/16 22:01] – clerie
+++ notiz:dual-stack-lite-linux [2025/11/20 20:09] (aktuell) – [References] clerie
@@ Zeile 19: / Zeile 19: @@
 <code>
-ip tunnel add "${TUNNEL_INTERFACE_NAME}" mode ipip6 local "${WAN_INTERFACE_ADDRESS}" remote "${AFTR_ADDRESS}"
+ip tunnel add "${TUNNEL_INTERFACE_NAME}" mode ipip6 local "${WAN_INTERFACE_ADDRESS}" remote "${AFTR_ADDRESS}" encaplimit none
 </code>
+==== Tunnel Encapsulation Limit ====
+Generic Packet Tunneling in IPv6 allows setting a [[https://www.rfc-editor.org/rfc/rfc2473#section-4.1.1|Tunnel Encapsulation Limit]].
+That limit is passed as Destination Option for IPv6.
+Unfortunately to AFTR of my provider Netcologne just throws away packets that contain Destination Options, except they carry ICMP.
+The Linux Kernel is setting a Tunnel Encapsulation Limit by default.
+As a workaround one can set ''encaplimit none'' at creation of the tunnel.
+That way, there are no Destination Options set and IPv4 is encapsulated directly.
 ===== AFTR Address Discovery =====
@@ Zeile 59: / Zeile 70: @@
   * [[https://git.archive.openwrt.org/?p=openwrt.git;a=blob;f=package/network/ipv6/ds-lite/files/dslite.sh;h=a7e0a10542b856aa640fd438558cfffe524d6c93;hb=575107bc975a3fb23ebc896e8035b043706be0b2|OpenWrt DS-Lite implementation]]
+  * [[https://www.netcologne.de/cms/api/fileadmin/user_upload/privatkunden/pdf/weitere-formulare/Schnittstellenbeschreibung.pdf|Netcologne Schnittstellenbeschreibung]]