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Date:      Sun, 14 Jun 2015 20:50:49 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-ports-bugs@FreeBSD.org
Subject:   [Bug 200860] Failed do-not-fragment ping when using PPPoE over FTTX connection
Message-ID:  <bug-200860-13@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200860

            Bug ID: 200860
           Summary: Failed do-not-fragment ping when using PPPoE over FTTX
                    connection
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs@FreeBSD.org
          Reporter: moj0@gmx.com

Issue:
ping -D -s 1472 yahoo.com
PING yahoo.com (98.138.253.109): 1472 data bytes
36 bytes from localhost (127.0.0.1): frag needed and DF set (MTU 1492)
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst
 4  5  00 05dc bc40   0 0000  40  01 3ec0 2.97.192.51  98.138.253.109

36 bytes from localhost (127.0.0.1): frag needed and DF set (MTU 1492)
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst
 4  5  00 05dc d846   0 0000  40  01 0000 2.97.192.51  98.138.253.109

36 bytes from localhost (127.0.0.1): frag needed and DF set (MTU 1492)
Vr HL TOS  Len   ID Flg  off TTL Pro  cks      Src      Dst
 4  5  00 05dc f4f7   0 0000  40  01 3ec0 2.97.192.51  98.138.253.109

Expected behavior:
ping -D -s 1472 www.dslreports.com
PING www.dslreports.com (64.91.255.98): 1472 data bytes
1480 bytes from 64.91.255.98: icmp_seq=0 ttl=47 time=122.827 ms
1480 bytes from 64.91.255.98: icmp_seq=1 ttl=47 time=123.011 ms
1480 bytes from 64.91.255.98: icmp_seq=2 ttl=47 time=122.368 ms
1480 bytes from 64.91.255.98: icmp_seq=3 ttl=47 time=122.715 ms
1480 bytes from 64.91.255.98: icmp_seq=4 ttl=47 time=122.640 ms

The assumption is that the WAN port is gigabit capable, and internet connection
is PPPoE over FTTX. PPPoE needs updating from legacy copper DSL/cable to modern
fiber optical, with the RFC 4638 extension. FTTX ISP equipment from the likes
of Cisco, Juniper and Huawei support this.

https://tools.ietf.org/html/rfc4638
http://comments.gmane.org/gmane.os.openbsd.tech/27554

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