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