Hi. We're having an issue with S2S tunnels to/from our office in China randomly dropping between there and our other sites in Europe and N America. Trouble is, the tunnels drop at different times and there isn't any pattern as to when they do drop. Looking at IKE View it gave a reason of 'fragmentation' (if the status is stuck in Phase 1; other times there is no tunnel entry in the list on SmartView monitor).
Pushing the policy to the affected sites sometimes fixes the issue but other times we just wait and the tunnels come back themselves. I've been advised this is most likely to be an issue upstream but it's happening too frequently now. Is there not anything we can do to try and prevent this? No config changes have been made on our side recently. Thanks in advance.
