diff options
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 8 | ||||
| -rw-r--r-- | include/net/tcp.h | 18 |
2 files changed, 20 insertions, 6 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index ca447b35b833..d64e53124b8c 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -439,7 +439,9 @@ tcp_stdurg - BOOLEAN tcp_synack_retries - INTEGER Number of times SYNACKs for a passive TCP connection attempt will be retransmitted. Should not be higher than 255. Default value - is 5, which corresponds to ~180seconds. + is 5, which corresponds to 31seconds till the last retransmission + with the current initial RTO of 1second. With this the final timeout + for a passive TCP connection will happen after 63seconds. tcp_syncookies - BOOLEAN Only valid when the kernel was compiled with CONFIG_SYNCOOKIES @@ -478,7 +480,9 @@ tcp_fastopen - INTEGER tcp_syn_retries - INTEGER Number of times initial SYNs for an active TCP connection attempt will be retransmitted. Should not be higher than 255. Default value - is 5, which corresponds to ~180seconds. + is 6, which corresponds to 63seconds till the last restransmission + with the current initial RTO of 1second. With this the final timeout + for an active TCP connection attempt will happen after 127seconds. tcp_timestamps - BOOLEAN Enable timestamps as defined in RFC1323. diff --git a/include/net/tcp.h b/include/net/tcp.h index 9a0021d16d91..0fca06f16463 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -98,11 +98,21 @@ 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 - * connection: ~180sec is RFC minimum */ +#define TCP_SYN_RETRIES 6 /* This is how many retries are done + * when active opening a connection. + * RFC1122 says the minimum retry MUST + * be at least 180secs. Nevertheless + * this value is corresponding to + * 63secs of retransmission with the + * current initial RTO. + */ -#define TCP_SYNACK_RETRIES 5 /* number of times to retry passive opening a - * connection: ~180sec is RFC minimum */ +#define TCP_SYNACK_RETRIES 5 /* This is how may retries are done + * when passive opening a connection. + * This is corresponding to 31secs of + * retransmission with the current + * initial RTO. + */ #define TCP_TIMEWAIT_LEN (60*HZ) /* how long to wait to destroy TIME-WAIT * state, about 60 seconds */ |