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ipv6: add sysctl_mld_qrv to configure query robustness variable

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This patch adds a new sysctl_mld_qrv knob to configure the mldv1/v2 query
robustness variable. It specifies how many retransmit of unsolicited mld
retransmit should happen. Admins might want to tune this on lossy links.

Also reset mld state on interface down/up, so we pick up new sysctl
settings during interface up event.

IPv6 certification requests this knob to be available.

I didn't make this knob netns specific, as it is mostly a setting in a
physical environment and should be per host.

Cc: Flavio Leitner <fbl@redhat.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa
2014-09-02 15:49:25 +02:00
committed by David S. Miller
parent b89df95d52
commit 2f711939d2
4 changed files with 31 additions and 10 deletions
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Documentation/networking/ip-sysctl.txt
+5
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@@ -1152,6 +1152,11 @@ anycast_src_echo_reply - BOOLEAN
FALSE: disabled
Default: FALSE
mld_qrv - INTEGER
Controls the MLD query robustness variable (see RFC3810 9.1).
Default: 2 (as specified by RFC3810 9.1)
Minimum: 1 (as specified by RFC6636 4.5)
IPv6 Fragmentation:
ip6frag_high_thresh - INTEGER