[ptxdist] [PATCH] /etc/hosts: add local ipv6 definitions

[ptxdist] [PATCH] /etc/hosts: add local ipv6 definitions

[Uwe Kleine-König]

It's 2021!

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 projectroot/etc/hosts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/projectroot/etc/hosts b/projectroot/etc/hosts
index ba712fe03341..4389b1ebc0df 100644
--- a/projectroot/etc/hosts
+++ b/projectroot/etc/hosts
@@ -1 +1,5 @@
 127.0.0.1	localhost
+
+::1		localhost ip6-localhost ip6-loopback
+ff02::1		ip6-allnodes
+ff02::2		ip6-allrouters
-- 
2.30.0


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Re: [ptxdist] [PATCH] /etc/hosts: add local ipv6 definitions

[Roland Hieber]

On Fri, Feb 26, 2021 at 10:26:43AM +0100, Uwe Kleine-König wrote:
> It's 2021!
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
>  projectroot/etc/hosts | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/projectroot/etc/hosts b/projectroot/etc/hosts
> index ba712fe03341..4389b1ebc0df 100644
> --- a/projectroot/etc/hosts
> +++ b/projectroot/etc/hosts
> @@ -1 +1,5 @@
>  127.0.0.1	localhost
> +
> +::1		localhost ip6-localhost ip6-loopback
> +ff02::1		ip6-allnodes
> +ff02::2		ip6-allrouters

Hmmm, I wonder if this works even if GLOBAL_IPV6 is turned off. Or
maybe we should get rid of GLOBAL_IPV6 too? :-)

 - Roland

-- 
Roland Hieber, Pengutronix e.K.          | r.hieber@pengutronix.de     |
Steuerwalder Str. 21                     | https://www.pengutronix.de/ |
31137 Hildesheim, Germany                | Phone: +49-5121-206917-0    |
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Re: [ptxdist] [PATCH] /etc/hosts: add local ipv6 definitions

[Alexander Dahl]

Hei hei,

> Roland Hieber <rhi@pengutronix.de> hat am 26.02.2021 14:24 geschrieben:
> Hmmm, I wonder if this works even if GLOBAL_IPV6 is turned off. Or
> maybe we should get rid of GLOBAL_IPV6 too? :-)

I know this sounds tempting, but please don't do that. We still support systems with only 32 MiB RAM and not much more flash and have to save every byte we can. We have IPv6 turned off, because there's absolutely no demand for it from our customers and disabling it in kernel and userland gets us a little more space.

Greets
Alex

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Re: [ptxdist] [PATCH] /etc/hosts: add local ipv6 definitions

[Michael Olbrich]

Hi,

On Mon, Mar 01, 2021 at 06:43:40AM +0100, Alexander Dahl wrote:
> > Roland Hieber <rhi@pengutronix.de> hat am 26.02.2021 14:24 geschrieben:
> > Hmmm, I wonder if this works even if GLOBAL_IPV6 is turned off. Or

I just tried this:

root@DistroKit:~ ping ip6-localhost
PING ip6-localhost (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: seq=0 ttl=64 time=9.578 ms

That surprised me a bit but I think that's fine.

> > maybe we should get rid of GLOBAL_IPV6 too? :-)
> 
> I know this sounds tempting, but please don't do that. We still support
> systems with only 32 MiB RAM and not much more flash and have to save
> every byte we can. We have IPv6 turned off, because there's absolutely no
> demand for it from our customers and disabling it in kernel and userland
> gets us a little more space.

No worries. That option will stay a wile longer. So, I'm guessing you're
not using systemd there either, right?

Michael


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Re: [ptxdist] [PATCH] /etc/hosts: add local ipv6 definitions

[Alexander Dahl]

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Hei hei,

On Mon, Mar 01, 2021 at 09:45:35AM +0100, Michael Olbrich wrote:
> On Mon, Mar 01, 2021 at 06:43:40AM +0100, Alexander Dahl wrote:
> > I know this sounds tempting, but please don't do that. We still support
> > systems with only 32 MiB RAM and not much more flash and have to save
> > every byte we can. We have IPv6 turned off, because there's absolutely no
> > demand for it from our customers and disabling it in kernel and userland
> > gets us a little more space.
> 
> No worries. That option will stay a wile longer. So, I'm guessing you're
> not using systemd there either, right?

Correct. No systemd, no udev, no dbus, just busybox init and our
applications.

Our newer hardware has 128 MiB of RAM (the awesome SAMA5D27 SiP
package), but the old hardware will still stay a while, it was shipped
to industrial customers, you can imagine, what that means. ;-)

Greets
Alex

-- 
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\ / CAMPAIGN     | speech censured, the first thought forbidden, the
 X  AGAINST      | first freedom denied, chains us all irrevocably.«
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Re: [ptxdist] [PATCH] /etc/hosts: add local ipv6 definitions

[Uwe Kleine-König]

[-- Attachment #1.1: Type: text/plain, Size: 1137 bytes --]

On Mon, Mar 01, 2021 at 09:45:35AM +0100, Michael Olbrich wrote:
> Hi,
> 
> On Mon, Mar 01, 2021 at 06:43:40AM +0100, Alexander Dahl wrote:
> > > Roland Hieber <rhi@pengutronix.de> hat am 26.02.2021 14:24 geschrieben:
> > > Hmmm, I wonder if this works even if GLOBAL_IPV6 is turned off. Or
> 
> I just tried this:
> 
> root@DistroKit:~ ping ip6-localhost
> PING ip6-localhost (127.0.0.1): 56 data bytes
> 64 bytes from 127.0.0.1: seq=0 ttl=64 time=9.578 ms

Does it really say 127.0.0.1 if you ping ip6-localhost?
On my distrokit build I cannot reproduce that:

	root@DistroKit:~ ping -c3 ip6-localhost
	PING ip6-localhost (::1): 56 data bytes
	64 bytes from ::1: seq=0 ttl=64 time=1.209 ms
	64 bytes from ::1: seq=1 ttl=64 time=4.836 ms
	64 bytes from ::1: seq=2 ttl=64 time=3.668 ms

	--- ip6-localhost ping statistics ---
	3 packets transmitted, 3 packets received, 0% packet loss
	round-trip min/avg/max = 1.209/3.237/4.836 ms

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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Re: [ptxdist] [PATCH] /etc/hosts: add local ipv6 definitions

[Michael Olbrich]

On Mon, Mar 01, 2021 at 09:41:03PM +0100, Uwe Kleine-König wrote:
> On Mon, Mar 01, 2021 at 09:45:35AM +0100, Michael Olbrich wrote:
> > Hi,
> > 
> > On Mon, Mar 01, 2021 at 06:43:40AM +0100, Alexander Dahl wrote:
> > > > Roland Hieber <rhi@pengutronix.de> hat am 26.02.2021 14:24 geschrieben:
> > > > Hmmm, I wonder if this works even if GLOBAL_IPV6 is turned off. Or
                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

> > 
> > I just tried this:
> > 
> > root@DistroKit:~ ping ip6-localhost
> > PING ip6-localhost (127.0.0.1): 56 data bytes
> > 64 bytes from 127.0.0.1: seq=0 ttl=64 time=9.578 ms
> 
> Does it really say 127.0.0.1 if you ping ip6-localhost?

It does if GLOBAL_IPV6 (and BUSYBOX_FEATURE_IPV6) is disabled.

And for 'ping -4 ip6-localhost' if both are enabled. There seems to be some
kind of fallback for this.

Michael

> On my distrokit build I cannot reproduce that:
> 
> 	root@DistroKit:~ ping -c3 ip6-localhost
> 	PING ip6-localhost (::1): 56 data bytes
> 	64 bytes from ::1: seq=0 ttl=64 time=1.209 ms
> 	64 bytes from ::1: seq=1 ttl=64 time=4.836 ms
> 	64 bytes from ::1: seq=2 ttl=64 time=3.668 ms
> 
> 	--- ip6-localhost ping statistics ---
> 	3 packets transmitted, 3 packets received, 0% packet loss
> 	round-trip min/avg/max = 1.209/3.237/4.836 ms

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: [ptxdist] [APPLIED] /etc/hosts: add local ipv6 definitions

[Michael Olbrich]

Thanks, applied as 04d573ffb3c05e0c99dd50d2764a72b45c902a6e.

Michael

[sent from post-receive hook]

On Fri, 05 Mar 2021 08:26:15 +0100, Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:
> It's 2021!
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> Message-Id: <20210226092643.165523-1-u.kleine-koenig@pengutronix.de>
> Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
> 
> diff --git a/projectroot/etc/hosts b/projectroot/etc/hosts
> index ba712fe03341..4389b1ebc0df 100644
> --- a/projectroot/etc/hosts
> +++ b/projectroot/etc/hosts
> @@ -1 +1,5 @@
>  127.0.0.1	localhost
> +
> +::1		localhost ip6-localhost ip6-loopback
> +ff02::1		ip6-allnodes
> +ff02::2		ip6-allrouters

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