CentOS - Oct 2016 - IPv6 address configuration and default IPv6 address with CentOS 6.8?

Hello,

when I have this in /etc/sysconfig/network-scripts/ifcfg-eth0

TYPE=Ethernet
NAME=eth0
NM_CONTROLLED=no
ONBOOT=yes
DEVICE=eth0
USERCTL=no
...
IPV6INIT=yes
IPV6ADDR=2001:DB8:DEAD:BEEF::10
IPV6ADDR_SECONDARIES="2001:DB8:DEAD:BEEF::20 2001:DB8:DEAD:BEEF::30 
2001:DB8:DEAD:BEEF::40 2001:DB8:DEAD:BEEF::50"
IPV6_AUTOCONF=no
IPV6_DEFAULTGW=2001:DB8:DEAD:BEEF::1
IPV6_DEFAULTDEV=eth0

I have a virtual server, and there are the alias addresses splitted,
e.g. IPv6 2001:DB8:DEAD:BEEF::40 is used by BIND (named, authoritativ 
DNS server)
IPv6 2001:DB8:DEAD:BEEF::30 is used by MTA (postfix, DNS has this for MX 
of this domain)
IPv6 2001:DB8:DEAD:BEEF::20 and 2001:DB8:DEAD:BEEF::10 are used by 
Apache (httpd)
...

and this is also splitted in the firewallconfig ip6tables

-A INPUT -d 2001:DB8:DEAD:BEEF::30 -m tcp -p tcp --dport 25 -m state 
--state NEW -j ACCEPT
-A INPUT -m tcp -p tcp --dport 25 -j DROP

-A INPUT -d 2001:DB8:DEAD:BEEF::40 -m tcp -p tcp --dport 53 -m state 
--state NEW -j ACCEPT
-A INPUT -d 2001:DB8:DEAD:BEEF::40 -m udp -p udp --dport 53 -j ACCEPT
-A INPUT -m tcp -p tcp --dport 53 -j DROP
-A INPUT -m udp -p udp --dport 53 -j DROP


where can I define which IPv6 address is used as source IP, when doing
e.g.    wget ...
            ssh ...
            ... | mail test at example.com
            ...

Thanks,
Walter

On 10/15/2016 1:15 AM, Walter H. wrote:
>
>
> where can I define which IPv6 address is used as source IP, when doing
> e.g.    wget ...
>            ssh ...
>            ... | mail test at example.com
on wget, its --bind-address
on ssh, its -b xxxx

mail will, afaik, forward the eemail to your local MTA, which in turn 
will decide what to do with it, so its your MTA that would need to be 
configured with a bind address, that would be postfix or whatever.



-- 
john r pierce, recycling bits in santa cruz

On 15.10.2016 10:42, John R Pierce wrote:
> On 10/15/2016 1:15 AM, Walter H. wrote:
>>
>>
>> where can I define which IPv6 address is used as source IP, when doing
>> e.g.    wget ...
>>            ssh ...
>>            ... | mail test at example.com
>
> on wget, its --bind-address>
> on ssh, its -b xxxx
>
> mail will, afaik, forward the eemail to your local MTA, which in turn 
> will decide what to do with it, so its your MTA that would need to be 
> configured with a bind address, that would be postfix or whatever.
>
Thanks,
I see, programs do it their way, and there is no global setting like 
"use xxxx";

Grettings,
Walter