默认的MSS是512(虽然IP包默认576,减去40后是536) thresh和cwnd都是以字节为单位 4.4很保守,超时就CWND=mss,不过thresh最小为2*mss caseTCPT_REXMT:// TCP_MAXRXTSHIFT = 12if(++tp->t_rxtshift>TCP_MAXRXTSHIFT){// 重传次数达到13,关闭连接tp->t_rxtshift=TCP_MAXRXTSHIFT;tcpstat.tcps_timeoutdrop+...
讨论一个完整的TCP连接所发生的实际分组交换情况,包括连接建立、数据传送和连接终止3个阶段,并且表明每个端点所历经的TCP状态。 (1) 客户通告一个值为536的MSS(最大分节大小),表明该客户只实现了最小重组缓冲区大小;服务器通告一个值为1460的MSS(以太网上IPv4的典型值)。不同方向上MSS值可以不同。 (2) 连接建...
tp->t_maxseg; /* * Only call tcp_output when there * Only call tcplp_output when there * is new data available to be sent. * Otherwise we would send pure ACKs. */ @@ -2231,7 +2231,7 @@ tcp_do_segment(struct ip6_hdr* ip6, struct tcphdr *th, otMessage* msg, avail = l...
This memo discusses the TCP Maximum Segment Size Option and related topics. The purposes is to clarify some aspects of TCP and its interaction with IP. This memo is a clarification to the TCP specification, and contains information that may be considered as "advice to implementers”. 1. Introd...
SOCKET。 optname：需要访问的选项名 （后面会有）（取决于level） optval：对于getsockopt()，指向返回选项值的缓冲。对于setsockopt()，指向包含新选项值的缓冲。 optlen：对于getsockopt()，作为入口参数时，选项值的最大长度。作为出口参数时，选项值的实际长度。对于setsockopt()，现选项的长度。
print-whois.c print-zep.c print-zephyr.c print-zeromq.c print.c print.h rpc_auth.h rpc_msg.h send-ack.awk signature.c signature.h slcompress.h smb.h smbutil.c status-exit-codes.h stime.awk strtoaddr.c strtoaddr.h tcp.h ...
* With an IP MSS of 576, this is 536, * but 512 is probably more convenient. * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). */ # define TCP_MSS 512 # define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ ...
rx_opt.user_mss:用户设置的本端 MSS。用户可以通过TCP_MAXSEG这个 socket 选项对这个字段进行设置,这个字段在rx_opt中,说明用户设置该字段起到的作用就如同收到了对端通告的 MSS 值。 rx_opt.mss_clamp: 连接建立阶段本端计算出的 MSS。它取user_mss和 对端 SYN(SYNACK) 报文通告的 MSS 值中的较小值,...
Search or jump to... Search code, repositories, users, issues, pull requests... Provide feedback We read every piece of feedback, and take your input very seriously. Include my email address so I can be contacted Cancel Submit feedback Saved searches Use saved searches to filter your...
As an example, here is the first part of the output for an ftp trace: # 134 chunks. 536 packets sent. 508 acks. 1 1 0.00 5.80 0.20 0.20 4 1 2 513 0.28 6.20 0.40 0.40 4 1 3 1025 1.16 6.32 1.20 1.20 4 1 4 1561 1.86 15.00 2.00 2.00 6 1 5 2049 2.16 15.44 2.20 2.20 5 1...