[PATCH 1/1] tcp: Increase timeout for SYN segments

[Alexander Bergmann]

Commit 9ad7c049 changed the initRTO from 3secs to 1sec in accordance to
RFC6298 (former RFC2988bis). This reduced the time till the last SYN
retransmission packet gets sent from 93secs to 31secs.

RFC1122 is stating that the retransmission should be done for at least 3
minutes, but this seems to be quite high.[1]

This patch increases the value of TCP_SYN_RETRIES to the value of 6,
providing a retransmission window of 63secs.

[1] RFC 1122 - 4.2.3.5 TCP Connection Failures

Signed-off-by: Alexander Bergmann <alex@xxxxxxxxxx>
---
 include/net/tcp.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 1f000ff..f309e93 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -98,7 +98,7 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
                                 * 15 is ~13-30min depending on RTO.
                                 */
 
-#define TCP_SYN_RETRIES         5      /* number of times to retry active opening a
+#define TCP_SYN_RETRIES         6      /* number of times to retry active opening a
                                 * connection: ~180sec is RFC minimum   */
 
 #define TCP_SYNACK_RETRIES 5   /* number of times to retry passive opening a
-- 
1.7.8.6

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