| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 19 Dec 2007 11:53:06 -0500 From: "James Nichols" <jamesnichols3@...il.com> To: "Eric Dumazet" <dada1@...mosbay.com> Cc: "Jan Engelhardt" <jengelh@...putergmbh.de>, linux-kernel@...r.kernel.org, "Linux Netdev List" <netdev@...r.kernel.org> Subject: Re: After many hours all outbound connections get stuck in SYN_SENT > So you see outgoing SYN packets, but no SYN replies coming from the remote > peer ? (you mention ACKS, but the first packet received from the remote > peer should be a SYN+ACK), Right, I meant to say SYN+ACK. I don't see them coming back. > When the problem comes, instead of restarting the application, please take a > tcpdump of say 10.000 packets. > Then turn off tcp_sack and take a 2nd tcpdump sample, and make both samples > available to us. I can take these captures and take a look at the results. Unfortunately, I don't think I'll be able to make the captures available to the general public. > If turning off tcp_sack makes the problem go away, why dont you turn it off > all the time ? Unfortunately, I think that will be the answer if I can't get any help fixing this problem in the kernel. It's a bummer, because many of the remote hosts my application communicates with are on wireless links, so there may be performance implications to turning SACK off. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists