I've asked our campus networking people if they've installed any filters but there's been no reply yet.
However, I doubt they'd block a specific host for a specific protocol; if they did any blocking it would be a complete block of either the host or the protocol, and I can ping the host and other sites are successfully connected using IPIP, so neither would seem to be the case. Perhaps someone in the path between us and Germany inserted a protocol 4 block, or perhaps the German router crashed and lost its routing tables.
No reply from Germany yet either. - Brian
On Wed, May 17, 2017 at 06:47:13PM +0200, Rob Janssen wrote:
Is that still the case? I receive plenty of traffic from that gateway, so when you don't there could be someone who inserted a protocol 4 filter along the way.