| 1 |
On Tue, Mar 9, 2021 at 10:10 PM Grant Taylor < |
| 2 |
gtaylor@×××××××××××××××××××××.net> wrote: |
| 3 |
> |
| 4 |
> On 2/21/21 3:23 PM, Grant Taylor wrote: |
| 5 |
> > Will someone please explain why the Gentoo AMD64 Handbook ~> Gentoo (at |
| 6 |
> > large) says to add the local host name to the 127.0.0.1 (or ::1) entry |
| 7 |
> > in the /etc/hosts file? What was the thought process behind that? |
| 8 |
> |
| 9 |
> Shameless Bump -- I'm still interested in understanding the logic |
| 10 |
> behind the choice in the Gentoo Handbook. |
| 11 |
> |
| 12 |
> Additional information. |
| 13 |
> |
| 14 |
> The Samba Wiki states the following in the Preparing the Installation |
| 15 |
> section of the Setting up Samba as an Active Directory Domain Controller |
| 16 |
> document. |
| 17 |
> |
| 18 |
> "The host name and FQDN must not resolve to the 127.0.0.1 IP address or |
| 19 |
> any other IP address than the one used on the LAN interface of the DC." |
| 20 |
> |
| 21 |
> Link - Setting up Samba as an Active Directory Domain Controller - |
| 22 |
> Preparing the Installation |
| 23 |
> - |
| 24 |
> |
| 25 |
https://wiki.samba.org/index.php/Setting_up_Samba_as_an_Active_Directory_Domain_Controller#Preparing_the_Installation |
| 26 |
> |
| 27 |
|
| 28 |
AND |
| 29 |
|
| 30 |
[quote] |
| 31 |
I'm reading Kerberos - The Definitive Guide[1] and it makes the |
| 32 |
following comment: |
| 33 |
|
| 34 |
> And to make matters worse, some Unix systems map their own hostname |
| 35 |
> to 127.0.0.1 (the loopback IP address). |
| 36 |
[/quote] |
| 37 |
|
| 38 |
Caveat - not an expert, just my meager understanding: |
| 39 |
|
| 40 |
1) The name 'localhost' is historically for developers who want to access |
| 41 |
their own machine _without_ using DNS. |
| 42 |
|
| 43 |
2) By general practice sometime in the deep, dark times 127.0.0.1 was |
| 44 |
accepted for this purpose. There's nothing special about the address. |
| 45 |
|
| 46 |
3) I read the original quoted comment in the Kerberos Guide as a warning - |
| 47 |
'to make matters worse, __SOME__" |
| 48 |
|
| 49 |
4) In my /etc/hosts I do _NOT_ map my machine's name to the same address as |
| 50 |
localhost, avoiding the Kerberos warning: |
| 51 |
|
| 52 |
mark@science:~$ cat /etc/hosts |
| 53 |
127.0.0.1 localhost |
| 54 |
127.0.1.1 science |
| 55 |
|
| 56 |
# The following lines are desirable for IPv6 capable hosts |
| 57 |
::1 ip6-localhost ip6-loopback |
| 58 |
fe00::0 ip6-localnet |
| 59 |
ff00::0 ip6-mcastprefix |
| 60 |
ff02::1 ip6-allnodes |
| 61 |
ff02::2 ip6-allrouters |
| 62 |
|
| 63 |
mark@science:~$ ping localhost |
| 64 |
PING localhost (127.0.0.1) 56(84) bytes of data. |
| 65 |
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.032 ms |
| 66 |
|
| 67 |
mark@science:~$ ping science |
| 68 |
PING science (127.0.1.1) 56(84) bytes of data. |
| 69 |
64 bytes from science (127.0.1.1): icmp_seq=1 ttl=64 time=0.032 ms |
| 70 |
|
| 71 |
mark@science:~$ hostname |
| 72 |
science |
| 73 |
mark@science:~$ hostname -I |
| 74 |
192.168.86.42 |
| 75 |
mark@science:~$ hostname -A |
| 76 |
science.lan |
| 77 |
mark@science:~$ hostname -f |
| 78 |
science |
| 79 |
mark@science:~$ hostname -i |
| 80 |
127.0.1.1 |
| 81 |
mark@science:~$ |
Archives