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https://issues.apache.org/jira/browse/TS-2520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14746374#comment-14746374
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Bryan Call commented on TS-2520:
--------------------------------
Example of TFO working in ATS:
{code}
15:14:31.123202 IP localhost.43750 > localhost.webcache: Flags [S], seq
1613604989:1613605022, win 65535, options [mss 65495,sackOK,TS val 1372954000
ecr 0,nop,wscale 8,unknown-34 0x479a145349ad1848,nop,nop], length 33: HTTP: GET
/ HTTP/1.1
15:14:31.123223 IP localhost.webcache > localhost.43750: Flags [S.], seq
1924942065, ack 1613605023, win 65535, options [mss 65495,sackOK,TS val
1372954000 ecr 1372954000,nop,wscale 8], length 0
15:14:31.123231 IP localhost.43750 > localhost.webcache: Flags [.], ack 1, win
512, options [nop,nop,TS val 1372954000 ecr 1372954000], length 0
15:14:31.123545 IP localhost.webcache > localhost.43750: Flags [P.], seq 1:498,
ack 1, win 512, options [nop,nop,TS val 1372954000 ecr 1372954000], length 497:
HTTP: HTTP/1.1 301 Moved Permanently
15:14:31.123566 IP localhost.43750 > localhost.webcache: Flags [.], ack 498,
win 516, options [nop,nop,TS val 1372954000 ecr 1372954000], length 0
15:14:31.123703 IP localhost.43750 > localhost.webcache: Flags [F.], seq 1, ack
498, win 516, options [nop,nop,TS val 1372954000 ecr 1372954000], length 0
15:14:31.123746 IP localhost.webcache > localhost.43750: Flags [F.], seq 498,
ack 2, win 512, options [nop,nop,TS val 1372954000 ecr 1372954000], length 0
15:14:31.123756 IP localhost.43750 > localhost.webcache: Flags [.], ack 499,
win 516, options [nop,nop,TS val 1372954000 ecr 1372954000], length 0
{code}
> Configuration variable to enable TFO
> ------------------------------------
>
> Key: TS-2520
> URL: https://issues.apache.org/jira/browse/TS-2520
> Project: Traffic Server
> Issue Type: New Feature
> Components: Configuration
> Reporter: Alex Sandro Garzão
> Priority: Trivial
> Fix For: sometime
>
>
> TFO (TCP Fast Open) can be enabled on all listen sockets in the kernel.
> Nevertheless, I would like that only ATS try using TFO.
> One possibility is a configuration variable that informs ATS to set
> TCP_FASTOPEN.
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