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authorJakub Sitnicki <jkbs@redhat.com>2017-08-23 10:55:41 +0300
committerDavid S. Miller <davem@davemloft.net>2017-08-25 04:05:43 +0300
commit22b6722bfa591ba03d6a0c5521b600d4ab2d9a27 (patch)
tree9bf3a5238858962f1b7c006bc3c152862998bf4f /Documentation/networking
parent39a7e5892418514db114ea4842d7d88aee6a61b8 (diff)
downloadlinux-22b6722bfa591ba03d6a0c5521b600d4ab2d9a27.tar.xz
ipv6: Add sysctl for per namespace flow label reflection
Reflecting IPv6 Flow Label at server nodes is useful in environments that employ multipath routing to load balance the requests. As "IPv6 Flow Label Reflection" standard draft [1] points out - ICMPv6 PTB error messages generated in response to a downstream packets from the server can be routed by a load balancer back to the original server without looking at transport headers, if the server applies the flow label reflection. This enables the Path MTU Discovery past the ECMP router in load-balance or anycast environments where each server node is reachable by only one path. Introduce a sysctl to enable flow label reflection per net namespace for all newly created sockets. Same could be earlier achieved only per socket by setting the IPV6_FL_F_REFLECT flag for the IPV6_FLOWLABEL_MGR socket option. [1] https://tools.ietf.org/html/draft-wang-6man-flow-label-reflection-01 Signed-off-by: Jakub Sitnicki <jkbs@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/ip-sysctl.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 84c9b8cee780..6b0bc0f71534 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1350,6 +1350,15 @@ flowlabel_state_ranges - BOOLEAN
FALSE: disabled
Default: true
+flowlabel_reflect - BOOLEAN
+ Automatically reflect the flow label. Needed for Path MTU
+ Discovery to work with Equal Cost Multipath Routing in anycast
+ environments. See RFC 7690 and:
+ https://tools.ietf.org/html/draft-wang-6man-flow-label-reflection-01
+ TRUE: enabled
+ FALSE: disabled
+ Default: FALSE
+
anycast_src_echo_reply - BOOLEAN
Controls the use of anycast addresses as source addresses for ICMPv6
echo reply