Ubuntu IPv6 ping self gives unknown host

up vote
3
down vote

favorite

I'm stuck trying to get IPv6 working on a new Ubuntu 16.04 (Xenial Xerus) install. My scenario is very basic - trying to ping the local IPv6 address.

$ ifconfig

enp0s25   Link encap:Ethernet  HWaddr b8:ae:ed:77:91:fa

          inet6 addr: fe80::ba94:3d5e:9929:4c6e/64 Scope:Link

and

$ ping6 -c 5 -I enp0s25 fe80::ba94:3d5e:9929:4c6e/64

results in

unknown host

How do I troubleshoot?

edited 2 days ago

Peter Mortensen

8,301166184

asked 2 days ago

jws

1956

New contributor

Bonk... I had tried that and got invalid argument, but, at that time I didn't specify -I also. Thanks!
– jws
2 days ago

superuser.com/questions/1005335/…
– harrymc
2 days ago

FYI: ifconfig is deprecated. You want to use ip address or ip a instead.
– Bakuriu
2 days ago

add a comment |

up vote
3
down vote

favorite

I'm stuck trying to get IPv6 working on a new Ubuntu 16.04 (Xenial Xerus) install. My scenario is very basic - trying to ping the local IPv6 address.

$ ifconfig

enp0s25   Link encap:Ethernet  HWaddr b8:ae:ed:77:91:fa

          inet6 addr: fe80::ba94:3d5e:9929:4c6e/64 Scope:Link

and

$ ping6 -c 5 -I enp0s25 fe80::ba94:3d5e:9929:4c6e/64

results in

unknown host

How do I troubleshoot?

edited 2 days ago

Peter Mortensen

8,301166184

asked 2 days ago

jws

1956

New contributor

Bonk... I had tried that and got invalid argument, but, at that time I didn't specify -I also. Thanks!
– jws
2 days ago

superuser.com/questions/1005335/…
– harrymc
2 days ago

FYI: ifconfig is deprecated. You want to use ip address or ip a instead.
– Bakuriu
2 days ago

add a comment |

up vote
3
down vote

favorite

I'm stuck trying to get IPv6 working on a new Ubuntu 16.04 (Xenial Xerus) install. My scenario is very basic - trying to ping the local IPv6 address.

$ ifconfig

enp0s25   Link encap:Ethernet  HWaddr b8:ae:ed:77:91:fa

          inet6 addr: fe80::ba94:3d5e:9929:4c6e/64 Scope:Link

and

$ ping6 -c 5 -I enp0s25 fe80::ba94:3d5e:9929:4c6e/64

results in

unknown host

How do I troubleshoot?

edited 2 days ago

Peter Mortensen

8,301166184

asked 2 days ago

jws

1956

New contributor

I'm stuck trying to get IPv6 working on a new Ubuntu 16.04 (Xenial Xerus) install. My scenario is very basic - trying to ping the local IPv6 address.

$ ifconfig

enp0s25   Link encap:Ethernet  HWaddr b8:ae:ed:77:91:fa

          inet6 addr: fe80::ba94:3d5e:9929:4c6e/64 Scope:Link

and

$ ping6 -c 5 -I enp0s25 fe80::ba94:3d5e:9929:4c6e/64

results in

unknown host

How do I troubleshoot?

ubuntu ipv6 localhost

edited 2 days ago

Peter Mortensen

8,301166184

asked 2 days ago

jws

1956

New contributor

edited 2 days ago

Peter Mortensen

8,301166184

asked 2 days ago

jws

1956

New contributor

edited 2 days ago

Peter Mortensen

8,301166184

edited 2 days ago

Peter Mortensen

8,301166184

edited 2 days ago

Peter Mortensen

8,301166184

asked 2 days ago

jws

1956

New contributor

asked 2 days ago

jws

1956

asked 2 days ago

jws

1956

New contributor

jws is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

Bonk... I had tried that and got invalid argument, but, at that time I didn't specify -I also. Thanks!
– jws
2 days ago

superuser.com/questions/1005335/…
– harrymc
2 days ago

FYI: ifconfig is deprecated. You want to use ip address or ip a instead.
– Bakuriu
2 days ago

add a comment |

Bonk... I had tried that and got invalid argument, but, at that time I didn't specify -I also. Thanks!
– jws
2 days ago

superuser.com/questions/1005335/…
– harrymc
2 days ago

FYI: ifconfig is deprecated. You want to use ip address or ip a instead.
– Bakuriu
2 days ago

Bonk... I had tried that and got invalid argument, but, at that time I didn't specify -I also. Thanks!
– jws
2 days ago

superuser.com/questions/1005335/…
– harrymc
2 days ago

FYI: ifconfig is deprecated. You want to use ip address or ip a instead.
– Bakuriu
2 days ago

add a comment |

2 Answers
2

active

oldest

votes

up vote
8
down vote

Works with /64 removed and -I specified. The /64 refers to the number of bits in the mask and shouldn't be used in ping.

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e

PING fe80::ba94:3d5e:9929:4c6e(fe80::ba94:3d5e:9929:4c6e) from fe80::ba94:3d5e:9929:4c6e enp0s25: 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.043 ms

The local interface argument -I can be specified in the address instead by appending % and the interface name:

$ ping6 fe80::ba94:3d5e:9929:4c6e%enp0s25

PING fe80::ba94:3d5e:9929:4c6e%enp0s25(fe80::ba94:3d5e:9929:4c6e) 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.027 ms

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=2 ttl=64 time=0.059 ms

...

These combinations don't work:

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e/64

unknown host

$ ping6 fe80::ba94:3d5e:9929:4c6e

connect: Invalid argument

edited 2 days ago

answered 2 days ago

jws

1956

New contributor

1

Is that an answer or a follow-up? This site is not a forum. It is a think tank.
– Peter Mortensen
2 days ago

1

@PeterMortensen it’s a valid answer, to Ping a link local network address you must specify the interface and to use a ip6 address with pink you must not specify a / suffix.
– eckes
2 days ago

@PeterMortensen This is a perfectly valid answer to the question. In fact it is even a better answer than the one posted later. This answer gives examples of valid syntax and points out that there are two different ways to specify the interface.
– kasperd
yesterday

add a comment |

up vote
8
down vote

You should not use the /64 on the address in the ping. That would be the equivalent of using a mask length or mask on the ping command for IPv4. I suppose the ping command was trying to interpret that as a host name.

edited 2 days ago

Twisty Impersonator

16.6k126090

answered 2 days ago

Ron Maupin

3,01511020

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
8
down vote

Works with /64 removed and -I specified. The /64 refers to the number of bits in the mask and shouldn't be used in ping.

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e

PING fe80::ba94:3d5e:9929:4c6e(fe80::ba94:3d5e:9929:4c6e) from fe80::ba94:3d5e:9929:4c6e enp0s25: 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.043 ms

The local interface argument -I can be specified in the address instead by appending % and the interface name:

$ ping6 fe80::ba94:3d5e:9929:4c6e%enp0s25

PING fe80::ba94:3d5e:9929:4c6e%enp0s25(fe80::ba94:3d5e:9929:4c6e) 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.027 ms

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=2 ttl=64 time=0.059 ms

...

These combinations don't work:

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e/64

unknown host

$ ping6 fe80::ba94:3d5e:9929:4c6e

connect: Invalid argument

edited 2 days ago

answered 2 days ago

jws

1956

New contributor

1

Is that an answer or a follow-up? This site is not a forum. It is a think tank.
– Peter Mortensen
2 days ago

1

@PeterMortensen it’s a valid answer, to Ping a link local network address you must specify the interface and to use a ip6 address with pink you must not specify a / suffix.
– eckes
2 days ago

@PeterMortensen This is a perfectly valid answer to the question. In fact it is even a better answer than the one posted later. This answer gives examples of valid syntax and points out that there are two different ways to specify the interface.
– kasperd
yesterday

add a comment |

up vote
8
down vote

Works with /64 removed and -I specified. The /64 refers to the number of bits in the mask and shouldn't be used in ping.

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e

PING fe80::ba94:3d5e:9929:4c6e(fe80::ba94:3d5e:9929:4c6e) from fe80::ba94:3d5e:9929:4c6e enp0s25: 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.043 ms

The local interface argument -I can be specified in the address instead by appending % and the interface name:

$ ping6 fe80::ba94:3d5e:9929:4c6e%enp0s25

PING fe80::ba94:3d5e:9929:4c6e%enp0s25(fe80::ba94:3d5e:9929:4c6e) 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.027 ms

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=2 ttl=64 time=0.059 ms

...

These combinations don't work:

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e/64

unknown host

$ ping6 fe80::ba94:3d5e:9929:4c6e

connect: Invalid argument

edited 2 days ago

answered 2 days ago

jws

1956

New contributor

1

Is that an answer or a follow-up? This site is not a forum. It is a think tank.
– Peter Mortensen
2 days ago

1

@PeterMortensen it’s a valid answer, to Ping a link local network address you must specify the interface and to use a ip6 address with pink you must not specify a / suffix.
– eckes
2 days ago

@PeterMortensen This is a perfectly valid answer to the question. In fact it is even a better answer than the one posted later. This answer gives examples of valid syntax and points out that there are two different ways to specify the interface.
– kasperd
yesterday

add a comment |

up vote
8
down vote

Works with /64 removed and -I specified. The /64 refers to the number of bits in the mask and shouldn't be used in ping.

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e

PING fe80::ba94:3d5e:9929:4c6e(fe80::ba94:3d5e:9929:4c6e) from fe80::ba94:3d5e:9929:4c6e enp0s25: 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.043 ms

The local interface argument -I can be specified in the address instead by appending % and the interface name:

$ ping6 fe80::ba94:3d5e:9929:4c6e%enp0s25

PING fe80::ba94:3d5e:9929:4c6e%enp0s25(fe80::ba94:3d5e:9929:4c6e) 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.027 ms

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=2 ttl=64 time=0.059 ms

...

These combinations don't work:

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e/64

unknown host

$ ping6 fe80::ba94:3d5e:9929:4c6e

connect: Invalid argument

edited 2 days ago

answered 2 days ago

jws

1956

New contributor

Works with /64 removed and -I specified. The /64 refers to the number of bits in the mask and shouldn't be used in ping.

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e

PING fe80::ba94:3d5e:9929:4c6e(fe80::ba94:3d5e:9929:4c6e) from fe80::ba94:3d5e:9929:4c6e enp0s25: 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.043 ms

The local interface argument -I can be specified in the address instead by appending % and the interface name:

$ ping6 fe80::ba94:3d5e:9929:4c6e%enp0s25

PING fe80::ba94:3d5e:9929:4c6e%enp0s25(fe80::ba94:3d5e:9929:4c6e) 56 data bytes

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=1 ttl=64 time=0.027 ms

64 bytes from fe80::ba94:3d5e:9929:4c6e: icmp_seq=2 ttl=64 time=0.059 ms

...

These combinations don't work:

$ ping6 -c 1 -I enp0s25 fe80::ba94:3d5e:9929:4c6e/64

unknown host

$ ping6 fe80::ba94:3d5e:9929:4c6e

connect: Invalid argument

edited 2 days ago

answered 2 days ago

jws

1956

New contributor

edited 2 days ago

answered 2 days ago

jws

1956

New contributor

answered 2 days ago

jws

1956

answered 2 days ago

jws

1956

New contributor

jws is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

1

Is that an answer or a follow-up? This site is not a forum. It is a think tank.
– Peter Mortensen
2 days ago

1

@PeterMortensen it’s a valid answer, to Ping a link local network address you must specify the interface and to use a ip6 address with pink you must not specify a / suffix.
– eckes
2 days ago

@PeterMortensen This is a perfectly valid answer to the question. In fact it is even a better answer than the one posted later. This answer gives examples of valid syntax and points out that there are two different ways to specify the interface.
– kasperd
yesterday

add a comment |

1

Is that an answer or a follow-up? This site is not a forum. It is a think tank.
– Peter Mortensen
2 days ago

1

@PeterMortensen it’s a valid answer, to Ping a link local network address you must specify the interface and to use a ip6 address with pink you must not specify a / suffix.
– eckes
2 days ago

@PeterMortensen This is a perfectly valid answer to the question. In fact it is even a better answer than the one posted later. This answer gives examples of valid syntax and points out that there are two different ways to specify the interface.
– kasperd
yesterday

Is that an answer or a follow-up? This site is not a forum. It is a think tank.
– Peter Mortensen
2 days ago

@PeterMortensen it’s a valid answer, to Ping a link local network address you must specify the interface and to use a ip6 address with pink you must not specify a / suffix.
– eckes
2 days ago

@PeterMortensen This is a perfectly valid answer to the question. In fact it is even a better answer than the one posted later. This answer gives examples of valid syntax and points out that there are two different ways to specify the interface.
– kasperd
yesterday

add a comment |

up vote
8
down vote

edited 2 days ago

Twisty Impersonator

16.6k126090

answered 2 days ago

Ron Maupin

3,01511020

add a comment |

up vote
8
down vote

edited 2 days ago

Twisty Impersonator

16.6k126090

answered 2 days ago

Ron Maupin

3,01511020

add a comment |

up vote
8
down vote

edited 2 days ago

Twisty Impersonator

16.6k126090

answered 2 days ago

Ron Maupin

3,01511020

edited 2 days ago

Twisty Impersonator

16.6k126090

answered 2 days ago

Ron Maupin

3,01511020

edited 2 days ago

Twisty Impersonator

16.6k126090

edited 2 days ago

Twisty Impersonator

16.6k126090

edited 2 days ago

Twisty Impersonator

16.6k126090

answered 2 days ago

Ron Maupin

3,01511020

answered 2 days ago

Ron Maupin

3,01511020

answered 2 days ago

Ron Maupin

3,01511020

add a comment |

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