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| author | Jakub Sitnicki <jkbs@redhat.com> | 2017-08-23 10:55:41 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-25 04:05:43 +0300 |
| commit | 22b6722bfa591ba03d6a0c5521b600d4ab2d9a27 (patch) | |
| tree | 9bf3a5238858962f1b7c006bc3c152862998bf4f /Documentation/networking | |
| parent | 39a7e5892418514db114ea4842d7d88aee6a61b8 (diff) | |
| download | linux-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.txt | 9 |
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 |