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Jessie networking with multiple IPs (IPv and IPv6), single physical NIC

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  Jessie networking with multiple IPs (IPv and IPv6), single physical NIC Tom Browder <tom.browder@gmail.com> - 2017-07-26 19:50 +0200
    Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC Sven Hartge <sven@svenhartge.de> - 2017-07-26 20:30 +0200
      Re: Jessie networking with multiple IPs (IPv and IPv6), single  physical NIC Georgi Naplatanov <gosho@oles.biz> - 2017-07-26 21:10 +0200
        Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC Sven Hartge <sven@svenhartge.de> - 2017-07-26 21:20 +0200
          Re: Jessie networking with multiple IPs (IPv and IPv6), single  physical NIC Tom Browder <tom.browder@gmail.com> - 2017-07-26 21:30 +0200
            Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC Sven Hartge <sven@svenhartge.de> - 2017-07-26 22:50 +0200
              Re: Jessie networking with multiple IPs (IPv and IPv6), single  physical NIC Tom Browder <tom.browder@gmail.com> - 2017-07-27 00:50 +0200
                Re: Jessie networking with multiple IPs (IPv and IPv6), single  physical NIC Tom Browder <tom.browder@gmail.com> - 2017-07-27 03:40 +0200
                Re: Jessie networking with multiple IPs (IPv and IPv6), single  physical NIC Curt <curty@free.fr> - 2017-07-31 18:20 +0200
                  Re: Jessie networking with multiple IPs (IPv and IPv6), single  physical NIC Wilko Fokken <wfokken@web.de> - 2017-07-31 20:10 +0200
                  Re: Jessie networking with multiple IPs (IPv and IPv6), single  physical NIC Tom Browder <tom.browder@gmail.com> - 2017-07-31 23:20 +0200

#184277 — Jessie networking with multiple IPs (IPv and IPv6), single physical NIC

Last year I successfully modified /etc/network/interfaces on my remote
debian 8 server to handle multiple IPv4 addresses on a single NIC, and
now I want to add its IPv6 capability.

But, before I do, I would like to show you my proposed new interfaces
file for comment and to make sure I don't break my server:

My hosting service has provisioned my server with the following IP
address information:

dns-nameservers 192.187.107.16 69.30.209.16

IPv4:
===
Gateway: 142.54.186.1
Subnet Mask: 255.255.255.248
assigned 142.54.186.2/29 which results in five addresses:
142.54.186.2
142.54.186.3
142.54.186.4
142.54.186.5
142.54.186.6

IPv6:
===
Gateway: 2604:4300:a:95::1
Subnet Mask: ffff:ffff:ffff:ffff::
assigned 2604:4300:a:95::2/64 and I will use the following five addresses:
2604:4300:a:95::2
2604:4300:a:95::3
2604:4300:a:95::4
2604:4300:a:95::5
2604:4300:a:95::6

The proposed /etc/network/interfaces file:
# begin =============================
iface eth0 inet static
        address 142.54.186.2
        netmask 255.255.255.248
        gateway 142.54.186.1
        dns-nameservers 192.187.107.16 69.30.209.16

        # add new IPv4 devices
        up   addr add 142.54.186.3/29 dev $IFACE label $IFACE:0
        down addr del 142.54.186.3/29 dev $IFACE label $IFACE:0

        up   addr add 142.54.186.4/29 dev $IFACE label $IFACE:1
        down addr del 142.54.186.4/29 dev $IFACE label $IFACE:1

        up   addr add 142.54.186.5/29 dev $IFACE label $IFACE:2
        down addr del 142.54.186.5/29 dev $IFACE label $IFACE:2

        up   addr add 142.54.186.6/29 dev $IFACE label $IFACE:3
        down addr del 142.54.186.6/29 dev $IFACE label $IFACE:3

iface eth0 inet6 static
        address 2604:4300:a:95::2
        netmask ffff:ffff:ffff:ffff::
        gateway 2604:4300:a:95::1
        dns-nameservers 192.187.107.16 69.30.209.16

        # add new IPv4 devices
        up   addr add 2604:4300:a:95::3/64 dev $IFACE label $IFACE:4
        down addr del 2604:4300:a:95::3/64 dev $IFACE label $IFACE:4

        up   addr add 2604:4300:a:95::4/64 dev $IFACE label $IFACE:5
        down addr del 2604:4300:a:95::4/64 dev $IFACE label $IFACE:5

        up   addr add 2604:4300:a:95::5/64 dev $IFACE label $IFACE:6
        down addr del 2604:4300:a:95::5/64 dev $IFACE label $IFACE:6

        up   addr add 2604:4300:a:95::6/64 dev $IFACE label $IFACE:7
        down addr del 2604:4300:a:95::6/64 dev $IFACE label $IFACE:7
# end =============================

Thanks for your help.

Best regards,

-Tom

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#184280

Tom Browder <tom.browder@gmail.com> wrote:

> The proposed /etc/network/interfaces file:
> # begin =============================
> iface eth0 inet static
>         address 142.54.186.2
>         netmask 255.255.255.248
>         gateway 142.54.186.1
>         dns-nameservers 192.187.107.16 69.30.209.16

>         # add new IPv4 devices
>         up   addr add 142.54.186.3/29 dev $IFACE label $IFACE:0
>         down addr del 142.54.186.3/29 dev $IFACE label $IFACE:0

You don't need those up/down parts, you can add additional blocks for
eth0:

auto eth0
iface eth0 inet static
        address 142.54.186.2
        netmask 255.255.255.248
        gateway 142.54.186.1
        dns-nameservers 192.187.107.16 69.30.209.16

iface eth0 inet static
        address 142.54.186.3
        netmask 255.255.255.248

iface eth0 inet static
        address 142.54.186.4
        netmask 255.255.255.248
[...]


> iface eth0 inet6 static
>         address 2604:4300:a:95::2
>         netmask ffff:ffff:ffff:ffff::
>         gateway 2604:4300:a:95::1
>         dns-nameservers 192.187.107.16 69.30.209.16

And the same here as well.

Grüße,
Sven.

-- 
Sigmentation fault. Core dumped.

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#184282 — Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC

On 07/26/2017 09:22 PM, Sven Hartge wrote:
> Tom Browder <tom.browder@gmail.com> wrote:
> 
>> The proposed /etc/network/interfaces file:
>> # begin =============================
>> iface eth0 inet static
>>         address 142.54.186.2
>>         netmask 255.255.255.248
>>         gateway 142.54.186.1
>>         dns-nameservers 192.187.107.16 69.30.209.16
> 
>>         # add new IPv4 devices
>>         up   addr add 142.54.186.3/29 dev $IFACE label $IFACE:0
>>         down addr del 142.54.186.3/29 dev $IFACE label $IFACE:0
> 
> You don't need those up/down parts, you can add additional blocks for
> eth0:
> 
> auto eth0
> iface eth0 inet static
>         address 142.54.186.2
>         netmask 255.255.255.248
>         gateway 142.54.186.1
>         dns-nameservers 192.187.107.16 69.30.209.16
>

I think that every additional interface should have suffix in its name -
eth0:1, et0:2, etc.

Example:

 iface eth0:1 inet static
         address 142.54.186.3
         netmask 255.255.255.248

 iface eth0:2 inet static
         address 142.54.186.4
         netmask 255.255.255.248


By the way Linux kernel supports virtual interfaces as well. I used this
feature when my local ISP forced me to use only one IPv4 address per MAC
address.

Kind regards
Georgi

> iface eth0 inet static
>         address 142.54.186.3
>         netmask 255.255.255.248
> 
> iface eth0 inet static
>         address 142.54.186.4
>         netmask 255.255.255.248
> [...]
> 
> 
>> iface eth0 inet6 static
>>         address 2604:4300:a:95::2
>>         netmask ffff:ffff:ffff:ffff::
>>         gateway 2604:4300:a:95::1
>>         dns-nameservers 192.187.107.16 69.30.209.16
> 
> And the same here as well.
> 
> Grüße,
> Sven.
> 

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#184283

Georgi Naplatanov <gosho@oles.biz> wrote:
> On 07/26/2017 09:22 PM, Sven Hartge wrote:
>> Tom Browder <tom.browder@gmail.com> wrote:
>> 
>>> The proposed /etc/network/interfaces file:
>>> # begin =============================
>>> iface eth0 inet static
>>>         address 142.54.186.2
>>>         netmask 255.255.255.248
>>>         gateway 142.54.186.1
>>>         dns-nameservers 192.187.107.16 69.30.209.16
>> 
>>>         # add new IPv4 devices
>>>         up   addr add 142.54.186.3/29 dev $IFACE label $IFACE:0
>>>         down addr del 142.54.186.3/29 dev $IFACE label $IFACE:0
>> 
>> You don't need those up/down parts, you can add additional blocks for
>> eth0:
>> 
>> auto eth0
>> iface eth0 inet static
>>         address 142.54.186.2
>>         netmask 255.255.255.248
>>         gateway 142.54.186.1
>>         dns-nameservers 192.187.107.16 69.30.209.16
>>

> I think that every additional interface should have suffix in its name -
> eth0:1, et0:2, etc.

No. That was ages ago and only a workaround for the broken ifconfig,
which is not able to cope with multiple IPv4 addresses per interface.

Since Wheezy you can have multiple "iface eth0 ..." blocks in
/e/n/interface without problems.

Grüße,
Sven

-- 
Sigmentation fault. Core dumped.

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#184284 — Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC

On Wed, Jul 26, 2017 at 2:11 PM, Sven Hartge <sven@svenhartge.de> wrote:
> Georgi Naplatanov <gosho@oles.biz> wrote:
>> On 07/26/2017 09:22 PM, Sven Hartge wrote:
>>> Tom Browder <tom.browder@gmail.com> wrote:
>>> You don't need those up/down parts, you can add additional blocks for
>>> eth0:
>>>
>>> auto eth0
>>> iface eth0 inet static
>>>         address 142.54.186.2
>>>         netmask 255.255.255.248
>>>         gateway 142.54.186.1
>>>         dns-nameservers 192.187.107.16 69.30.209.16
>>>
>
> Since Wheezy you can have multiple "iface eth0 ..." blocks in
> /e/n/interface without problems.

So can the above be simplified by leaving out the repeated info like
dns-nameservers, gateway, and netmask to give something like:

#=====================================
iface eth0 inet static
        address 142.54.186.2
        netmask 255.255.255.248
        gateway 142.54.186.1
        dns-nameservers 192.187.107.16 69.30.209.16
iface eth0 inet static
        address 142.54.186.3
iface eth0 inet static
        address 142.54.186.4
iface eth0 inet static
        address 142.54.186.5
iface eth0 inet static
        address 142.54.186.6

iface eth0 inet6 static
        address 2604:4300:a:95::2
        netmask ffff:ffff:ffff:ffff::
        gateway 2604:4300:a:95::1
        dns-nameservers 192.187.107.16 69.30.209.16
iface eth0 inet6 static
        address 2604:4300:a:95::3
iface eth0 inet6 static
        address 2604:4300:a:95::4
iface eth0 inet6 static
        address 2604:4300:a:95::5
iface eth0 inet6 static
        address 2604:4300:a:95::6
#=====================================

Thanks, Sven!

-Tom

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#184287

Tom Browder <tom.browder@gmail.com> wrote:
> On Wed, Jul 26, 2017 at 2:11 PM, Sven Hartge <sven@svenhartge.de> wrote:

> So can the above be simplified by leaving out the repeated info like
> dns-nameservers, gateway, and netmask to give something like:

> #=====================================
> iface eth0 inet static
>         address 142.54.186.2
>         netmask 255.255.255.248
>         gateway 142.54.186.1
>         dns-nameservers 192.187.107.16 69.30.209.16
> iface eth0 inet static
>         address 142.54.186.3
> iface eth0 inet static
>         address 142.54.186.4
> iface eth0 inet static
>         address 142.54.186.5
> iface eth0 inet static
>         address 142.54.186.6

I do believe you need the "netmask" option, but the rest is just needed
once. But from reading interfaces(5) I think you further simplify by
writing:

,----
|  auto eth0
|  iface eth0 inet static
|          address 142.54.186.2/29
|          gateway 142.54.186.1
|          dns-nameservers 192.187.107.16 69.30.209.16
|  iface eth0 inet static
|          address 142.54.186.3/29
|  iface eth0 inet static
|          address 142.54.186.4/29
|  iface eth0 inet static
|          address 142.54.186.5/29
|  iface eth0 inet static
|          address 142.54.186.6/29
`----

Grüße,
Sven.

-- 
Sigmentation fault. Core dumped.

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#184289 — Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC

On Wed, Jul 26, 2017 at 3:43 PM, Sven Hartge <sven@svenhartge.de> wrote:
> Tom Browder <tom.browder@gmail.com> wrote:
>> On Wed, Jul 26, 2017 at 2:11 PM, Sven Hartge <sven@svenhartge.de> wrote:
>
>> So can the above be simplified by leaving out the repeated info like
>> dns-nameservers, gateway, and netmask to give something like:
>
>> #=====================================
>> iface eth0 inet static
>>         address 142.54.186.2
>>         netmask 255.255.255.248
>>         gateway 142.54.186.1
>>         dns-nameservers 192.187.107.16 69.30.209.16
>> iface eth0 inet static
>>         address 142.54.186.3
>> iface eth0 inet static
>>         address 142.54.186.4
>> iface eth0 inet static
>>         address 142.54.186.5
>> iface eth0 inet static
>>         address 142.54.186.6
>
> I do believe you need the "netmask" option, but the rest is just needed
> once. But from reading interfaces(5) I think you further simplify by
> writing:
>
> ,----
> |  auto eth0
> |  iface eth0 inet static
> |          address 142.54.186.2/29
> |          gateway 142.54.186.1
> |          dns-nameservers 192.187.107.16 69.30.209.16
> |  iface eth0 inet static
> |          address 142.54.186.3/29
> |  iface eth0 inet static
> |          address 142.54.186.4/29
> |  iface eth0 inet static
> |          address 142.54.186.5/29
> |  iface eth0 inet static
> |          address 142.54.186.6/29
> `----

Okay, sounds good: I don't need to duplicate anything, then.

I admire your reading of man 5 interfaces. I find it very hard to
understand since the pieces seem so disconnected, and, as usual, man
pages are short on real examples.

I'm ready to try the new file and I'll report results later.

Thanks so much Sven.

Best regards,

-Tom

BTW, my wife and I and two friends had a very nice time visiting
Denmark in May while on a cruise in the Baltic celebrating our 50th
wedding anniversary.  Our ship, Holland-America's ms Rotterdam,
visited Copenhagen and Arhus and we enjoyed them very much--especially
Arhus.

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#184291 — Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC

On Wed, Jul 26, 2017 at 5:42 PM, Tom Browder <tom.browder@gmail.com> wrote:
> On Wed, Jul 26, 2017 at 3:43 PM, Sven Hartge <sven@svenhartge.de> wrote:
...
>> ,----
>> |  auto eth0
>> |  iface eth0 inet static
>> |          address 142.54.186.2/29
>> |          gateway 142.54.186.1
>> |          dns-nameservers 192.187.107.16 69.30.209.16
>> |  iface eth0 inet static
>> |          address 142.54.186.3/29
>> `----

Oops, I just looked at the ENTIRE active file and I forgot some lines
at the top:

#==================================
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet static
  address 142.54.186.2
  ...
#==================================

At any rate, I'm going to try the file (suitably modified) on a spare,
local server I have before going live remotely.

-Tom

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#184463 — Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC

On 2017-07-26, Tom Browder <tom.browder@gmail.com> wrote:
>
> Thanks so much Sven.
>
> Best regards,
>
> -Tom
>
> BTW, my wife and I and two friends had a very nice time visiting
> Denmark in May while on a cruise in the Baltic celebrating our 50th
> wedding anniversary.  Our ship, Holland-America's ms Rotterdam,
> visited Copenhagen and Arhus and we enjoyed them very much--especially
> Arhus.
>

Are you not confounding the de and dk domain suffixes, because I believe
Sven is 'de' (Germany).

Or maybe you know something I don't.

Never heard of Arhus.  

50th wedding anniversary. Do they give out medals for that? Or just
voyages to exotic places?

;-)

-- 
“Certitude is not the test of certainty.”
--Oliver Wendell Holmes, Jr.

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#184469 — Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC

On Mon, Jul 31, 2017 at 04:17:24PM +0000, Curt wrote:
> 
> Never heard of Arhus.  
 
 Aarhus is the main town of Jutland, Danmark.

-- 
 
 "Certitude is not the test of certainty."
 --Oliver Wendell Holmes, Jr.
 & 
 "Education is a man's going
  from cocksure ignorance
  to thoughtful uncertainty."
  (n.n.)

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#184475 — Re: Jessie networking with multiple IPs (IPv and IPv6), single physical NIC

[Multipart message — attachments visible in raw view] — view raw

On Mon, Jul 31, 2017 at 11:18 Curt <curty@free.fr> wrote:
...

> Are you not confounding the de and dk domain suffixes, because I believe
> Sven is 'de' (Germany).


You are certainly correct and I should have caught my error before
sending.  My apologies for any offended sensibilities.

50th wedding anniversary. Do they give out medals for that?


No, but we got lots of congratulations for staying the course and remaining
friends!

-Tom

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