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ROOT ‹ FreeBSD, Linux and AIX ‹ TCP/IP Networking ‹ TCP first packet loss

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TCP first packet loss

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satk
Post  Post subject: TCP first packet loss  |  Posted: Wed Dec 12, 2012 1:43 am

Joined: Wed Dec 12, 2012 1:28 am
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TCP first packet loss

hi,
i am implementing tcp per rfc 793, i have one doubt, that if tcp sent the 1st packet, but that is lost, now whether tcp should send second packet or, after retransmit the 1st packet and get the ack, the second pakcet should send.

if you know, please help me...





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admin
Post  Post subject: Re: TCP first packet loss  |  Posted: Tue Jan 22, 2013 9:20 am
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Joined: Mon Aug 03, 2009 8:43 am
Posts: 104

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Depends on the implementation.

By default, Linux has 5 retries for both SYN and SYN-ACK packets. Sysctl values below:
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_syn_retries = 5

FreeBSD 7 I see in tcpdump 4 syn+acks.

HTH


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