Hi , How to get access to min kenel git as i need to add some patches for reviews. Bhagaban On Sat, Nov 8, 2014 at 10:30 PM, <kernelnewbies-request@kernelnewbies.org> wrote:
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Today's Topics:
1. Re: Eudyptula challenge status (Drew Fustini) 2. RE: lots of connections in SYN_RECV state (Puneet Agarwal) 3. Re: lots of connections in SYN_RECV state (Valdis.Kletnieks@vt.edu) 4. Re: lots of connections in SYN_RECV state (Dave Tian) 5. RE: lots of connections in SYN_RECV state (Puneet Agarwal)
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Message: 1 Date: Fri, 7 Nov 2014 11:04:28 -0600 From: Drew Fustini <pdp7pdp7@gmail.com> Subject: Re: Eudyptula challenge status To: Dan <qsdconsulting@gmail.com> Cc: kernelnewbies <kernelnewbies@kernelnewbies.org> Message-ID: < CAEf4M_B6W3GJ8P_ShhpoL8QqtGEZ7h18p92BxuH0foQOQYj2Wg@mail.gmail.com> Content-Type: text/plain; charset=UTF-8
Yup, I submitted my current task 4 weeks ago, sent a note last week, and got reply the next day (Nov 1) with same sentiment: relax - everything is ok, it's a slow process, and it's not a race.
On Tue, Nov 4, 2014 at 8:59 PM, Dan <qsdconsulting@gmail.com> wrote:
Ramon Fried <ramon.fried <at> tandemg.com> writes:
Hey all. Tasks are pending for a long time. Anyone has Info regarding the queue? Thanks. Ramon
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I've been on challenge 5 for about a month and a half. I sent him a follow up email a few weeks ago and he replied "Relax, things are slow, there's no rush..."
His response times before that were usually less than 2 days.
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Message: 2 Date: Fri, 7 Nov 2014 23:11:26 +0530 From: Puneet Agarwal <puneet.agr@outlook.com> Subject: RE: lots of connections in SYN_RECV state To: Dave Tian <dave.jing.tian@gmail.com>, Silvan Jegen <me@sillymon.ch> Cc: "kernelnewbies@kernelnewbies.org" <kernelnewbies@kernelnewbies.org> Message-ID: <SNT153-W7011B59E54B5FD99A3604699850@phx.gbl> Content-Type: text/plain; charset="iso-8859-1"
I use linux kernel 2.6. I have enabled SYN cookies already. But that does not seem to solve the problem. Overall request latency is very high with these many half open connections.
Thanks and Regards Puneet ----------------------------------------
Subject: Re: lots of connections in SYN_RECV state From: dave.jing.tian@gmail.com Date: Fri, 7 Nov 2014 23:49:35 +0800 CC: puneet.agr@outlook.com; kernelnewbies@kernelnewbies.org To: me@sillymon.ch
Latest kernel provides a TCP SYN Cookie feature to defense from SYN flooding.
-daveti
On Nov 6, 2014, at 11:58 PM, Silvan Jegen <me@sillymon.ch> wrote:
2014-11-06 16:15,Puneet Agarwal:
Is there a way to check the reason, why they do not answer to the SYN-ACK's?
I don't think so. After all, they just don't answer and they won't tell you why (AFAIK there is no way to ask them why either)...
You could try to check for patterns in the incoming IP addresses to see from how many different places these connections are being made. I think that way it should be possible to figure out from which geographic location these problematic connections are coming from as well. What you would do with these findings I am not sure though.
If these connection negatively impact the performance of your servers you should definitely look into to countermeasures mentioned in the RFC here.
http://tools.ietf.org/html/rfc4987
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Message: 3 Date: Fri, 07 Nov 2014 13:10:05 -0500 From: Valdis.Kletnieks@vt.edu Subject: Re: lots of connections in SYN_RECV state To: Puneet Agarwal <puneet.agr@outlook.com> Cc: Dave Tian <dave.jing.tian@gmail.com>, Silvan Jegen <me@sillymon.ch>, "kernelnewbies@kernelnewbies.org" <kernelnewbies@kernelnewbies.org> Message-ID: <9736.1415383805@turing-police.cc.vt.edu> Content-Type: text/plain; charset="us-ascii"
On Fri, 07 Nov 2014 23:11:26 +0530, Puneet Agarwal said:
I use linux kernel 2.6. I have enabled SYN cookies already. But that does not seem to solve the problem. Overall request latency is very high with these many half open connections.
So, out of curiosity, where are all these half open connections coming from? Are they from addresses in your local network? Outside sites that *should* be connecting? Places you've never heard and and probably *shouldn't* be connecting?
(Also, if you have properly implemented syncookies, you shouldn't *have* any half-open connections. That's the whole point of syncookies....)