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On Wed, 1 Feb 2006, kelly wrote:
Ah I see. The 'ip address' command has a few
params. The 'ip addr' command will just apply the
first or only ip address. 'ip addr add' adds
another address. The secondary address.
no it does not unless one spcifically applies the secondary param to the
command, otherwise it applies the next and all proceeding addresses as
globals, like this:
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0d:56:11:11:11 brd ff:ff:ff:ff:ff:ff
inet 20.20.80.18/28 brd 20.20.80.31 scope global eth0
inet 20.20.80.19/32 scope global eth0
inet 20.20.80.20/32 scope global eth0
inet 20.20.80.21/32 scope global eth0
inet 20.20.80.22/32 scope global eth0
inet 20.20.80.23/32 scope global eth0
inet 20.20.80.24/32 scope global eth0
inet 20.20.80.25/32 scope global eth0
inet 20.20.80.26/32 scope global eth0
inet 20.20.80.27/32 scope global eth0
inet 20.20.80.28/32 scope global eth0
inet 20.20.80.29/32 scope global eth0
inet 20.20.80.30/32 scope global eth0
3: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:11:11:11:60 brd ff:ff:ff:ff:ff:ff
inet 192.168.80.19/28 brd 192.168.80.31 scope global eth1
If secondary is appended to the command, then secondary is applied to the
additional IP's and the ip add show output for that interfaces IP's. My
questions is; beside being able to flush all addresses by flushing the
main global address, what is the significance of the "secondary" attribute
to the ip addr add command?
note the difference above to what is in your paper;
1: lo: mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
2: eth0: mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:10:5a:10:0d:37 brd ff:ff:ff:ff:ff:ff
inet 12.12.12.2/24 brd 12.12.12.255 scope global eth0
inet 12.12.12.12/24 scope global secondary eth0
3: eth1: mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:10:5a:10:0d:34 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.1/24 brd 192.168.1.255 scope global eth1
In my output there is no "scope global secondary", never used that param
on the commandline when setting up NAT, and yet mine works...
#ip add help
Usage: ip addr {add|del} IFADDR dev STRING
ip addr {show|flush} [ dev STRING ] [ scope SCOPE-ID ]
[ to PREFIX ] [ FLAG-LIST ] [ label PATTERN ]
IFADDR := PREFIX | ADDR peer PREFIX
[ broadcast ADDR ] [ anycast ADDR ]
[ label STRING ] [ scope SCOPE-ID ]
SCOPE-ID := [ host | link | global | NUMBER ]
FLAG-LIST := [ FLAG-LIST ] FLAG
FLAG := [ permanent | dynamic | secondary | primary |
tentative | deprecated ]
This is all undecipherable, and not explained at all in the man page, nor
in the document that I did enjoy and wished I'd had found when fisrt
setting up my 1:1 NAT setup. But as I keep asking what is the reall
significance of the secondary attribute being added to the command as
suggested but poorly explained in the documantation. Not adding that
param and it all works fine, so what does that param addition really by me
in a 1:1 NAT setup?
[SNIPPED old replies in this thread]
Thanks,
Ron DuFresne
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