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author | Jason Reeder <jasonreeder@gmail.com> | 2017-02-16 04:14:38 -0600 |
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committer | Lennart Poettering <lennart@poettering.net> | 2017-02-16 11:14:38 +0100 |
commit | 0cbc024d591e1b1095d90494e0337dabd9ef2e19 (patch) | |
tree | 57390c3c4240bd0f350a66d85606daf139cc04cc /test/.gitignore | |
parent | 11814bbbae6674a12cfc1d82db4b44653696a674 (diff) |
libsystemd-network: ipv4ll probe conflict counter (#5361)
A bug exists where the conflict counter is cleared
regardless of whether or not the next probe attempt leads to
a successful address acquisition. This causes 'bursts' of
MAX_CONFLICTS probes followed by a delay of
RATE_LIMIT_INTERVAL instead of a single probe each
RATE_LIMIT_INTERVAL when beyond MAX_CONFLICTS.
The conflict counter should only be cleared after an
address is successfully acquired. This commit achieves that
goal.
From RFC3927:
A host should maintain a counter of the number of address
conflicts it has experienced in the process of trying to
acquire an address, and if the number of conflicts exceeds
MAX_CONFLICTS then the host MUST limit the rate at which it
probes for new addresses to no more than one new address per
RATE_LIMIT_INTERVAL. This is to prevent catastrophic ARP
storms in pathological failure cases, such as a rogue host
that answers all ARP probes, causing legitimate hosts to go
into an infinite loop attempting to select a usable address.
Signed-off-by: Jason Reeder <jasonreeder@gmail.com>
Diffstat (limited to 'test/.gitignore')
0 files changed, 0 insertions, 0 deletions