IPv6 black magic : rtt diferit in functie de subnet

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Salutare! La prima mea intilnire efectiva cu ipv6 (pus ipv6 de la edge=20
la nod) am intilnit o chestie foarte ciudata legata de ping ..
se da un /48 ce am zis ca il impartim in /64 pentru un management mai=20
usor (un plus exista posibilitatea ca upstream-ul sa poata sa ia o=20
decizie diferita de rutare pentru o clasa anume dedicata unui scop=20
specific) .. so, datele problemei arata asa :
GATEWAY : MYNET::1/48
DESKTOP : MYNET::aa/64

IPV4DESKTOP !=3D IPV4 storage02 (dar ambele publice)
GW =3D L3 hp switch
storage02 =3D EL7
DESKTOP =3D fedora27

Testele

[root@storage02 ~]# ip -6 -o a show dev enp2s0f1 scope global
5: enp2s0f1    inet6 MYNET:1::22/48 scope global noprefixroute

[root@storage02 ~]# ping6 -qc 10 MYNET::1
PING MYNET::1(MYNET::1) 56 data bytes

--- MYNET::1 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9013ms
rtt min/avg/max/mdev =3D 1.035/7.611/62.753/18.393 ms
                        ^^^^^^^^^^^^^^^^^^^^^^^^^

[root@storage02 ~]# ping6 -qc 10 MYNET::aa
PING MYNET::aa(MYNET::aa) 56 data bytes

--- MYNET::aa ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9208ms
rtt min/avg/max/mdev =3D 0.122/0.152/0.194/0.027 ms
                        ^^^^^^^^^^^^^^^^^^^^^^^^^

######################################################################

[root@storage02 ~]# ip -6 -o a show dev enp2s0f1 scope global
5: enp2s0f1    inet6 MYNET:1::22/64 scope global noprefixroute

[root@storage02 ~]# ping6 -qc 10 MYNET::1
PING MYNET::1(MYNET::1) 56 data bytes

--- MYNET::1 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9011ms
rtt min/avg/max/mdev =3D 0.987/3.824/26.409/7.535 ms
                        ^^^^^^^^^^^^^^^^^^^^^^^^^

[root@storage02 ~]# ping6 -qc 10 MYNET::aa
PING MYNET::aa(MYNET::aa) 56 data bytes

--- MYNET::aa ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9242ms
rtt min/avg/max/mdev =3D 0.119/0.146/0.175/0.019 ms
                        ^^^^^^^^^^^^^^^^^^^^^^^^^

######################################################################

[root@storage02 ~]# ip -6 -o a show dev enp2s0f1 scope global
5: enp2s0f1    inet6 MYNET::200/64 scope global noprefixroute

[root@storage02 ~]# ping6 -qc 10 MYNET::1
PING MYNET::1(MYNET::1) 56 data bytes

--- MYNET::1 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9012ms
rtt min/avg/max/mdev =3D 1.011/10.705/89.338/26.233 ms
                        ^^^^^^^^^^^^^^^^^^^^^^^^^

[root@storage02 ~]# ping6 -qc 10 MYNET::aa
PING MYNET::aa(MYNET::aa) 56 data bytes

--- MYNET::aa ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9228ms
rtt min/avg/max/mdev =3D 0.150/0.182/0.249/0.032 ms
                        ^^^^^^^^^^^^^^^^^^^^^^^^^
######################################################################
IPv4 reference

[root@storage02 ~]# ping -qc 10 IPV4GW
PING IPV4GW (IPV4GW) 56(84) bytes of data.

--- IPV4GW ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9115ms
rtt min/avg/max/mdev =3D 0.688/3.278/12.293/4.376 ms

[root@storage02 ~]# ping -qc 10 IPV4DESKTOP
PING IPV4DESKTOP (IPV4DESKTOP) 56(84) bytes of data.

--- IPV4DESKTOP ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9212ms
rtt min/avg/max/mdev =3D 0.119/0.149/0.189/0.024 ms

Intrebarile sunt :
1. de ce indiferent de ip al storage02 pingul la desktop e minimal?
2. de ce variaza rtt-ul in functie de subnet? din ce vad minimul e cand=20
storage02 are MYNET:1::22/64

Exista anumite optiuni ce _trebuiesc_ activate pe switch desi sunt la=20
categoria "optionale"?

Multumesc frumos de ajutor si lamuriri!!
Adrian






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