[192771] in North American Network Operators' Group
Re: pay.gov and IPv6
daemon@ATHENA.MIT.EDU (Carl Byington)
Sun Nov 20 20:21:05 2016
X-Original-To: nanog@nanog.org
From: Carl Byington <carl@five-ten-sg.com>
To: nanog@nanog.org
In-Reply-To: <20161121002634.2128F5A93C7F@rock.dv.isc.org>
Date: Sun, 20 Nov 2016 17:03:41 -0800
Errors-To: nanog-bounces@nanog.org
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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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