Bug 200860 (RFC4638)

Summary:	Failed do-not-fragment ping when using PPPoE over FTTX connection
Product:	Base System	Reporter:	moj0
Component:	kern	Assignee:	freebsd-net (Nobody) <net>
Status:	Closed FIXED
Severity:	Affects Many People	CC:	archie, eugen, mav, moj0
Priority:	---
Version:	CURRENT
Hardware:	Any
OS:	Any

Description moj0 2015-06-14 20:50:49 UTC

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

Comment 1 Eugene Grosbein freebsd_committer

2018-07-28 08:28:39 UTC

Just use net/mpd5 port/package that has requested RFC 4638 PPPoE client support.