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[iproute] man: ip-route.8: Add notes about dropped IPv4 route cache

Message ID 20161130082948.21925-1-phil@nwl.cc
State Accepted, archived
Delegated to: stephen hemminger
Headers show

Commit Message

Phil Sutter Nov. 30, 2016, 8:29 a.m. UTC 
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 man/man8/ip-route.8.in | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/man/man8/ip-route.8.in b/man/man8/ip-route.8.in
index d4fae3cc783ba..c0acaa0020ef7 100644
--- a/man/man8/ip-route.8.in
+++ b/man/man8/ip-route.8.in
@@ -924,6 +924,12 @@  routes are left unchanged. Any routes specified in the data stream that
 already exist in the table will be ignored.
 .RE
 
+.SH NOTES
+Starting with Linux kernel version 3.6, there is no routing cache for IPv4
+anymore. Hence
+.B "ip route show cached"
+will never print any entries on systems with this or newer kernel versions.
+
 .SH EXAMPLES
 .PP
 ip ro