I am trying to configure a Linux box with all possible VLANs (4094 of
them), and a subnet on each VLAN. Creating the VLANs isn''t a problem.
But, when I try to use "ip addr add ..." commands to assign an IP
address to each VLAN interface, I get to do about 280 of them before all
the interfaces on the box become unresponsive. I''ve also tried to
assign
the same IP addresses all to eth0, and I get the same result.
The problem seems to hinge on the distinction between primary and
secondary addresses.
If you''re reading the LARTC list, then you''ve probably had the
need
(e.g., load testing) to assign thousands of IP addresses to a single
interface. However, it''s usually the case that one is assigning
multiple
addresses that all belong to the same subnet. In that case, the first
such IP address is "primary" and all the additional addresses that
belong to the same subnet are "secondary". My investigations tell me
that "secondary" addresses are much lighter-weight. On the other hand,
I
don''t seem to be able to assign more than about 280 "primary"
addresses
in the entire system before all the interfaces become unresponsive.
For additional information about "primary" vs. "secondary"
addresses,
take a look at:
http://www.linux-ip.net/html/linux-ip.html#tools-ip-address-add
http://www.linux-ip.net/gl/ip-cref/node33.html
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