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[Launchpad Bug Tracker <1418552@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: isc-dhcp (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1418552

Title:
  dhclient uses lots of memory on systems with many interfaces

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  This is with 4.2.4-7ubuntu12, but since there's not a lot of code
  changing in ISC dhcpd (and its client), I guess this is a quite
  general problem: We're currently preapring a box to test a captive
  portal, thus this system has a hugh amount (ie. 1000) interfaces
  bridged to a physical network port.

  Calling dhclient (with a custom script to configure the different
  interfaces independently by using non-default routing tables) works
  perfectly find for the first few interfaces. However, when there are
  already a few hundred interfaces up, it takes longer and longer for
  each new dhclient instance to get an IP address.

  As strace reveals, it seems dhclient scans all interfaces, even
  several times, during start-up. I guess that it prepares data for each
  interface that's already configured with an IP address, thus wasting a
  lot of memory for no good. This should be reported upstream.

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