IPV6 ip getting deleted after ping

muzaffar.k · May 13, 2015, 3:04am

Hi,

IPV6 ip is getting deleted after ping,

[root@mindlanf-6 ~]# ifconfig eth4 add 7878:12::10/64 up
[root@mindlanf-6 ~]# ifconfig eth4
eth4      Link encap:Ethernet  HWaddr 00:07:43:05:AA:29
          inet6 addr: fe80::207:43ff:fe05:aa29/64 Scope:Link
          inet6 addr: 7878:12::10/64 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:24031645 errors:166 dropped:8087 overruns:0 frame:166
          TX packets:33924594 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:9531309570 (8.8 GiB)  TX bytes:31712244556 (29.5 GiB)
          Interrupt:56 Memory:fb881000-fb881fff

=======================================

[root@mindnic-02 ~]# ifconfig eth4 add 7878:12::100/64 up
[root@mindnic-02 ~]# ifconfig eth4
eth4      Link encap:Ethernet  HWaddr 00:07:43:05:9F:7B
          inet6 addr: 7878:12::100/64 Scope:Global
          inet6 addr: fe80::207:43ff:fe05:9f7b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9937950108 errors:169919 dropped:0 overruns:0 frame:169919
          TX packets:17023336684 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1016781713179 (946.9 GiB)  TX bytes:23062364317367 (20.9 TiB)
          Interrupt:169 Memory:e8801000-e8801fff

[root@mindnic-02 ~]#

=========================================

[root@mindnic-02 ~]# ping6 7878:12::10
PING 7878:12::10(7878:12::10) 56 data bytes
64 bytes from 7878:12::10: icmp_seq=0 ttl=64 time=0.118 ms
64 bytes from 7878:12::10: icmp_seq=1 ttl=64 time=0.198 ms
64 bytes from 7878:12::10: icmp_seq=2 ttl=64 time=0.193 ms
64 bytes from 7878:12::10: icmp_seq=3 ttl=64 time=0.134 ms
64 bytes from 7878:12::10: icmp_seq=4 ttl=64 time=0.176 ms
64 bytes from 7878:12::10: icmp_seq=5 ttl=64 time=0.193 ms
64 bytes from 7878:12::10: icmp_seq=6 ttl=64 time=0.164 ms
64 bytes from 7878:12::10: icmp_seq=7 ttl=64 time=0.175 ms
64 bytes from 7878:12::10: icmp_seq=8 ttl=64 time=0.165 ms
64 bytes from 7878:12::10: icmp_seq=9 ttl=64 time=0.145 ms
64 bytes from 7878:12::10: icmp_seq=10 ttl=64 time=0.141 ms

==========================================

[root@mindlanf-6 ~]# ping6 7878:12::100
PING 7878:12::100(7878:12::100) 56 data bytes
64 bytes from 7878:12::100: icmp_seq=1 ttl=64 time=0.139 ms
64 bytes from 7878:12::100: icmp_seq=2 ttl=64 time=0.137 ms
64 bytes from 7878:12::100: icmp_seq=3 ttl=64 time=0.131 ms
64 bytes from 7878:12::100: icmp_seq=4 ttl=64 time=0.151 ms
64 bytes from 7878:12::100: icmp_seq=5 ttl=64 time=0.135 ms
64 bytes from 7878:12::100: icmp_seq=6 ttl=64 time=0.124 ms
64 bytes from 7878:12::100: icmp_seq=7 ttl=64 time=0.139 ms
64 bytes from 7878:12::100: icmp_seq=8 ttl=64 time=0.137 ms
64 bytes from 7878:12::100: icmp_seq=9 ttl=64 time=0.155 ms
64 bytes from 7878:12::100: icmp_seq=10 ttl=64 time=0.142 ms
64 bytes from 7878:12::100: icmp_seq=11 ttl=64 time=0.130 ms

==============================================

[root@mindlanf-6 ~]# ethtool eth4
Settings for eth4:
        Supported ports: [ AUI FIBRE ]
        Supported link modes:   10000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: No
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Speed: 10000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: off
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x000000ff (255)
                               drv probe link timer ifdown ifup rx_err tx_err
        Link detected: yes
[root@mindlanf-6 ~]# ifconfig eth4
eth4      Link encap:Ethernet  HWaddr 00:07:43:05:AA:29
          inet6 addr: fe80::207:43ff:fe05:aa29/64 Scope:Link
          inet6 addr: 7878:12::10/64 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:24032308 errors:166 dropped:8087 overruns:0 frame:166
          TX packets:33924696 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:9531366714 (8.8 GiB)  TX bytes:31712256832 (29.5 GiB)
          Interrupt:56 Memory:fb881000-fb881fff

now IPV6 ip got erased and ping will stop

[root@mindlanf-6 ~]# ifconfig eth4
eth4      Link encap:Ethernet  HWaddr 00:07:43:05:AA:29
          inet6 addr: fe80::207:43ff:fe05:aa29/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:24032426 errors:166 dropped:8087 overruns:0 frame:166
          TX packets:33924717 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:9531376502 (8.8 GiB)  TX bytes:31712259478 (29.5 GiB)
          Interrupt:56 Memory:fb881000-fb881fff

[root@mindlanf-6 ~]#

============================================

[root@mindnic-02 ~]# ping6 7878:12::10
PING 7878:12::10(7878:12::10) 56 data bytes
64 bytes from 7878:12::10: icmp_seq=0 ttl=64 time=0.118 ms
64 bytes from 7878:12::10: icmp_seq=1 ttl=64 time=0.198 ms
64 bytes from 7878:12::10: icmp_seq=2 ttl=64 time=0.193 ms
64 bytes from 7878:12::10: icmp_seq=3 ttl=64 time=0.134 ms
64 bytes from 7878:12::10: icmp_seq=4 ttl=64 time=0.176 ms
64 bytes from 7878:12::10: icmp_seq=5 ttl=64 time=0.193 ms
64 bytes from 7878:12::10: icmp_seq=6 ttl=64 time=0.164 ms
64 bytes from 7878:12::10: icmp_seq=7 ttl=64 time=0.175 ms
64 bytes from 7878:12::10: icmp_seq=8 ttl=64 time=0.165 ms
64 bytes from 7878:12::10: icmp_seq=9 ttl=64 time=0.145 ms
64 bytes from 7878:12::10: icmp_seq=10 ttl=64 time=0.141 ms
64 bytes from 7878:12::10: icmp_seq=11 ttl=64 time=0.212 ms
64 bytes from 7878:12::10: icmp_seq=12 ttl=64 time=0.111 ms
64 bytes from 7878:12::10: icmp_seq=13 ttl=64 time=0.158 ms
64 bytes from 7878:12::10: icmp_seq=14 ttl=64 time=0.246 ms
64 bytes from 7878:12::10: icmp_seq=15 ttl=64 time=0.163 ms
64 bytes from 7878:12::10: icmp_seq=16 ttl=64 time=0.195 ms
64 bytes from 7878:12::10: icmp_seq=17 ttl=64 time=0.203 ms
64 bytes from 7878:12::10: icmp_seq=18 ttl=64 time=0.196 ms
64 bytes from 7878:12::10: icmp_seq=19 ttl=64 time=0.236 ms
64 bytes from 7878:12::10: icmp_seq=20 ttl=64 time=0.199 ms
64 bytes from 7878:12::10: icmp_seq=21 ttl=64 time=0.182 ms
64 bytes from 7878:12::10: icmp_seq=22 ttl=64 time=0.171 ms
64 bytes from 7878:12::10: icmp_seq=23 ttl=64 time=0.213 ms
64 bytes from 7878:12::10: icmp_seq=24 ttl=64 time=0.137 ms
64 bytes from 7878:12::10: icmp_seq=25 ttl=64 time=0.203 ms
64 bytes from 7878:12::10: icmp_seq=26 ttl=64 time=0.170 ms
64 bytes from 7878:12::10: icmp_seq=27 ttl=64 time=0.159 ms
64 bytes from 7878:12::10: icmp_seq=28 ttl=64 time=0.145 ms
64 bytes from 7878:12::10: icmp_seq=29 ttl=64 time=0.154 ms
64 bytes from 7878:12::10: icmp_seq=30 ttl=64 time=0.200 ms
64 bytes from 7878:12::10: icmp_seq=31 ttl=64 time=0.140 ms
64 bytes from 7878:12::10: icmp_seq=32 ttl=64 time=0.147 ms
64 bytes from 7878:12::10: icmp_seq=33 ttl=64 time=0.205 ms
64 bytes from 7878:12::10: icmp_seq=34 ttl=64 time=0.134 ms
64 bytes from 7878:12::10: icmp_seq=35 ttl=64 time=0.142 ms
64 bytes from 7878:12::10: icmp_seq=36 ttl=64 time=0.178 ms
64 bytes from 7878:12::10: icmp_seq=37 ttl=64 time=0.214 ms
64 bytes from 7878:12::10: icmp_seq=38 ttl=64 time=0.201 ms

--- 7878:12::10 ping statistics ---
50 packets transmitted, 39 received, 22% packet loss, time 49005ms
rtt min/avg/max/mdev = 0.111/0.174/0.246/0.035 ms, pipe 2

what could be the reason for this, please help me resolve this issue.

Thanks,
Muzaffar

RudiC · May 13, 2015, 4:01am

I'm not sure I understand what you describe nor what your question is. I can't see ping6 stopped. What I infer from your samples is that you add an IPv6 address on two different nodes (mindlanf-6 and mindnic-02). Deleting it from one node will keep the ping6 running, in accordance with what we see.

muzaffar.k · May 13, 2015, 5:46am

I am not deleting ipv6 adress, once we issue ping command from one client after some time automatically ip will be erased from that interface and ping will stop.

sea · May 13, 2015, 5:54am

Not much of ipv6 experience i have, but here are some thoughts:

You are setting an IP manualy, have you disabled dhcp?
You are setting a 2nd ipv6 adress to your device.

          inet6 addr: fe80::207:43ff:fe05:aa29/64 Scope:Link
          inet6 addr: 7878:12::10/64 Scope:Global

To my eyes, the ipv6 you are setting, seems invalid (quite too short).

hth

muzaffar.k · May 13, 2015, 6:04am

I am not using any dhcp server here, I am assigning it statically.
same thing works for Redhat client but we are facing the issue on fedora OS

inet6 addr: 7878:12::10/64 Scope:Global

Its correct I.P,

is there anything which I need to enable..?

neutronscott · May 13, 2015, 8:54am

You probably have duplicate addresses on the interface. You can force Linux to disable duplicate address detection:

sysctl net.ipv6.conf.eth4.accept_dad=0

muzaffar.k · May 14, 2015, 7:19am

sysctl net.ipv6.conf.eth4.accept_dad=0

I tried adding this, but after 15 mins I.P is getting erased again..

neutronscott · May 14, 2015, 7:41am

Then you're probably running NetworkManager. Stop it, or use it to configure the interface.

muzaffar.k · May 22, 2015, 7:55am

Thank you for ur comments, after stopping the NetworkManager service it seems to be working. I am monitoring the behavior of the interface if it gives the same problem then I will update,

can you please clarify how it worked after disabling NetworkManager, any specific reason..?

neutronscott · May 22, 2015, 8:59am

NetworkManager configures an interface. You'd need to set it up rather than use ifconfig. It seems to apply its configuration periodically, in this case is nil.

So if you've a GUI and NetworkManager, just use it to set your static IP rather than ifconfig from the command line.

There is a command-line utility for NetworkManager, nmcli , but I tend to use a GUI on the desktop and no NetworkManager on a server so I've no experience to offer about it.