Hi,
I'm trying to configure a ceph cluster using IPv6 only but I can't enable jumbo frames. I made the definition on the
'interfaces' file and it seems like the value is applied but when I test it looks like only works on IPv4, not IPv6.
It works on IPv4:
--- ceph-node02 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.254/0.338/0.474/0.099 ms
--- ceph-node02 ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3024ms
root@ceph-node01:~#
--
root@ceph-node01:~# ping -c 3 -M do -s 8972 ceph-node02
PING ceph-node02 (x.x.x.x) 8972(9000) bytes of data.
8980 bytes from ceph-node02 (x.x.x.x): icmp_seq=1 ttl=64 time=0.474 ms
8980 bytes from ceph-node02 (x.x.x.x): icmp_seq=2 ttl=64 time=0.254 ms
8980 bytes from ceph-node02 (x.x.x.x): icmp_seq=3 ttl=64 time=0.288 ms
PING ceph-node02 (x.x.x.x) 8972(9000) bytes of data.
8980 bytes from ceph-node02 (x.x.x.x): icmp_seq=1 ttl=64 time=0.474 ms
8980 bytes from ceph-node02 (x.x.x.x): icmp_seq=2 ttl=64 time=0.254 ms
8980 bytes from ceph-node02 (x.x.x.x): icmp_seq=3 ttl=64 time=0.288 ms
--- ceph-node02 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.254/0.338/0.474/0.099 ms
root@ceph-node01:~#
But *not* in IPv6:
root@ceph-node01:~# ping6 -c 3 -M do -s 8972 ceph-node02
PING ceph-node02(x:x:x:x:x:x:x:x) 8972 data bytes
ping: local error: Message too long, mtu=1500
ping: local error: Message too long, mtu=1500
ping: local error: Message too long, mtu=1500
PING ceph-node02(x:x:x:x:x:x:x:x) 8972 data bytes
ping: local error: Message too long, mtu=1500
ping: local error: Message too long, mtu=1500
ping: local error: Message too long, mtu=1500
--- ceph-node02 ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3024ms
root@ceph-node01:~#
root@ceph-node01:~# ifconfig
eno1 Link encap:Ethernet HWaddr 24:6e:96:05:55:f8
inet6 addr: 2a02:x:x:x:x:x:x:x/64 Scope:Global
inet6 addr: fe80::266e:96ff:fe05:55f8/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1
RX packets:633318 errors:0 dropped:0 overruns:0 frame:0
TX packets:649607 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:463355602 (463.3 MB) TX bytes:498891771 (498.8 MB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:127420 errors:0 dropped:0 overruns:0 frame:0
TX packets:127420 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:179470326 (179.4 MB) TX bytes:179470326 (179.4 MB)
root@ceph-node01:~#
root@ceph-node01:~# cat /etc/network/interfaces
# This file describes network interfaces avaiulable on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eno1
iface eno1 inet6 auto
post-up ifconfig eno1 mtu 9000
root@ceph-node01:#
Please help!
Félix Barbeira.
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