pay.gov and IPv6
Carl Byington
carl at five-ten-sg.com
Mon Nov 21 01:03:41 UTC 2016
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On Mon, 2016-11-21 at 11:26 +1100, Mark Andrews wrote:
> And the advertised MSS was what? On my box I'm seeing 1220 for
> IPv6 compared with 1460 for IPv4. 1220 shouldn't see PMTU problems.
--> 2001:8d8:100f:f000::2d5 syn w/ mss 1440
<-- 2001:8d8:100f:f000::2d5 syn,ack w/ mss 1420
--> 2001:8d8:100f:f000::2d5 ack
--> 2001:8d8:100f:f000::2d5 GET / HTTP/1.1
<-- 2001:8d8:100f:f000::2d5 ack
<-- 2001:8d8:100f:f000::2d5 data...
data is a 1480 byte ipv6 packet:
ip6.header.payload.length = 1440 which is the tcp packet
tcp.header.length = 32 bytes
tcp.data.size = 1408 bytes (http response)
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