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2 comments:
File doc/manuals/chapters/running.adoc:
When running osmo-ggsn, the user must take network Maximum Transmission Unit
(MTU) into consideration, and configure it based on network specific setup.
Indeed there's nothing wrong with IP fragmentation. The problem is, as usual, broken middleboxes. […]
I'm not aware of any common breakage preventing transporting fragmented IP packets across networks. The only frequent problems I know about is PMTU discovery failures, which really are just ICMP filtering.
Patch Set #5, Line 122: OsmOGGSN
Sure, but it is still interesting to document imho since: […]
"95% of the traffic will be TCP": I think that's no longer the case today. There's bittorrent, openvpn, ipsec/esp, wiregurad, RTP (for webrtc, whatever), there's QUIC, etc. - if anything I think the percentage of TCP traffic of the users on the public net is likely decreasing than increasing. I have not investigated how well those various other protocols handle MTU issues.
"increasing the outer MTU" that's basically what 29.060 annex C states: (paraphrasing from memory): "When you cannot enlarge the outer MTU across the entire transport network as needed, then you should consider reducing the inner MTU to avoid fragmentation overhead"
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