From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f169.google.com (mail-ob0-f169.google.com [209.85.214.169]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 764C421F0F2 for ; Fri, 4 Jan 2013 12:43:32 -0800 (PST) Received: by mail-ob0-f169.google.com with SMTP id v19so15369357obq.14 for ; Fri, 04 Jan 2013 12:43:31 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-originating-ip:in-reply-to:references:date :message-id:subject:from:to:cc:content-type:x-gm-message-state; bh=haJmShczJabnyMwxoEjAPCvzc41qRspQwq4lgWgP6rA=; b=Ig90ezCuNImmDMFWurgsKSbWNKwWmBbla1Krru6EANiG13j25q28TGlfDpKcFAP8P5 M2clOe5Im/Of7kwkaDo1TEBG4FPPwAS/42GZ/ptDCkSEDhom7kEgI0X4BMz19zyLEuF8 9CZC1PxuwLs3s5BvDoEvjCznR4NM2TYHaPVMJirOXLTyXlKYGKyCRnPxMDXFgpPSvyvF IfZohiWZYdJIHS+tEdCXp3zSu2M6mxO8bgNPIyCxVAMl/Y4opeAauv35/uILTUvQcGdE SiTupx6XDUdw9zZfSGsv200QF8TJrctUeySTBHQGAE0RbXMaATqG36n9Z3YAm6dDPWtk veVw== MIME-Version: 1.0 Received: by 10.182.12.101 with SMTP id x5mr40205694obb.47.1357332211630; Fri, 04 Jan 2013 12:43:31 -0800 (PST) Received: by 10.76.82.73 with HTTP; Fri, 4 Jan 2013 12:43:31 -0800 (PST) X-Originating-IP: [77.65.47.165] In-Reply-To: References: Date: Fri, 4 Jan 2013 21:43:31 +0100 Message-ID: From: Maciej Soltysiak To: Dave Taht , Ketan Kulkarni Content-Type: multipart/alternative; boundary=f46d0444690951036104d27c881e X-Gm-Message-State: ALoCoQm3zZ/m2hVYgTWyjDqvI7zMG5MBdU7ZQIK0DkOFgs0h5+2iOWzFRFX39dmb93n2oBpggpML Cc: Jerry Chu , Eric Dumazet , cerowrt-devel@lists.bufferbloat.net Subject: Re: [Cerowrt-devel] TFO crashes cerowrt 3.7.1-1 X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Jan 2013 20:43:32 -0000 --f46d0444690951036104d27c881e Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Oops, apologies if email was formatted weirdly... On Fri, Jan 4, 2013 at 9:42 PM, Maciej Soltysiak wrot= e: > I am seeing something strange here, with polipo related to TFO but also > DNS. > When I just took 3.7.1-1 and set my windows 7 laptop to use > gw.home.lan:8123 as http proxy it didn't work. What I observed was: > A) after quite a while polipo's response to browser was 504 Host > www.osnews.com lookup failed: Timeout > b) this error in ssh console: Host osnews.com lookup failed: Timeout > (131072) > c) Disabling TFO by adding option useTCPFastOpen 'false' to config > 'polipo' 'general' works around the problem > d) Alternatively, you can keep TFO enabled in polipo but change option > 'dnsUseGethostbyname' from 'reluctantly' to 'true' (!) > This is very weird, because TFO is TCP and the DNS queries fired off by > polipo are UDP: > root@OpenWrt:/tmp/log# tcpdump -n -v -vv -vvv -x -X -s 1500 -i lo > 20:21:56.160245 IP (tos 0x0, ttl 64, id 50129, offset 0, flags [DF], prot= o > UDP (17), length 60) > 127.0.0.1.47304 > 127.0.0.1.53: [bad udp cksum 0xfe3b -> 0xd17f!] 55396+ > A? www.osnews.com. (32) > 0x0000: 4500 003c c3d1 4000 4011 78dd 7f00 0001 E..<..@.@.x..... > 0x0010: 7f00 0001 b8c8 0035 0028 fe3b d864 0100 .......5.(.;.d.. > 0x0020: 0001 0000 0000 0000 0377 7777 066f 736e .........www.osn > 0x0030: 6577 7303 636f 6d00 0001 0001 ews.com..... > 20:21:56.160319 IP (tos 0x0, ttl 64, id 50130, offset 0, flags [DF], prot= o > UDP (17), length 60) > 127.0.0.1.47304 > 127.0.0.1.53: [bad udp cksum 0xfe3b -> 0xd164!] 55396+ > AAAA? www.osnews.com. (32) > 0x0000: 4500 003c c3d2 4000 4011 78dc 7f00 0001 E..<..@.@.x..... > 0x0010: 7f00 0001 b8c8 0035 0028 fe3b d864 0100 .......5.(.;.d.. > 0x0020: 0001 0000 0000 0000 0377 7777 066f 736e .........www.osn > 0x0030: 6577 7303 636f 6d00 001c 0001 ews.com..... > 20:21:56.169942 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UD= P > (17), length 123) > 127.0.0.1.53 > 127.0.0.1.47304: [bad udp cksum 0xfe7a -> 0x5f73!] 55396 q= : > A? www.osnews.com. 1/2/0 www.osnews.com. [29m3s] A 74.86.31.159 ns: > osnews.com. [29m3s] NS ns2.swelter.net., osnews.com. [29m3s] NS > ns1.swelter.net. (95) > 0x0000: 4500 007b 0000 4000 4011 3c70 7f00 0001 E..{..@.@. 0x0010: 7f00 0001 0035 b8c8 0067 fe7a d864 8180 .....5...g.z.d.. > 0x0020: 0001 0001 0002 0000 0377 7777 066f 736e .........www.osn > 0x0030: 6577 7303 636f 6d00 0001 0001 c00c 0001 ews.com......... > 0x0040: 0001 0000 06cf 0004 4a56 1f9f c010 0002 ........JV...... > 0x0050: 0001 0000 06cf 0011 036e 7332 0773 7765 .........ns2.swe > 0x0060: 6c74 6572 036e 6574 00c0 1000 0200 0100 lter.net........ > 0x0070: 0006 cf00 0603 6e73 31c0 40 ......ns1.@ > 20:21:56.173901 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UD= P > (17), length 135) > 127.0.0.1.53 > 127.0.0.1.47304: [bad udp cksum 0xfe86 -> 0x8ecb!] 55396 q= : > AAAA? www.osnews.com. 1/2/0 www.osnews.com. [54m44s] AAAA > 2607:f0d0:1002:62::3 ns: osnews.com. [29m3s] NS ns1.swelter.net., > osnews.com. [29m3s] NS ns2.swelter.net. (107) > 0x0000: 4500 0087 0000 4000 4011 3c64 7f00 0001 E.....@.@. 0x0010: 7f00 0001 0035 b8c8 0073 fe86 d864 8180 .....5...s...d.. > 0x0020: 0001 0001 0002 0000 0377 7777 066f 736e .........www.osn > 0x0030: 6577 7303 636f 6d00 001c 0001 c00c 001c ews.com......... > 0x0040: 0001 0000 0cd4 0010 2607 f0d0 1002 0062 ........&......b > 0x0050: 0000 0000 0000 0003 c010 0002 0001 0000 ................ > 0x0060: 06cf 0011 036e 7331 0773 7765 6c74 6572 .....ns1.swelter > 0x0070: 036e 6574 00c0 1000 0200 0100 0006 cf00 .net............ > 0x0080: 0603 6e73 32c0 4c ..ns2.L > This is the only DNS traffic I saw during the attempts. The tcpdumps have > udp bad checksum but when I disabled TFO in polipo, the UDP where still b= ad > checksum but they worked. > Really weird. > p.s. UPNP still works for port forwarding negotiation as it did in 3.6.11= -4 > I still couldn't get the UPNP/SSDP broadcasts (udp to 239.255.255.250) to > being forwarded between se00 and sw00/sw10. Last time it worked was ~3.3.= 8. > I'm starting not to question why it doesn't work, I'm starting to wonder > why it did work then ;-) > Regards, > Maciej > On Fri, Jan 4, 2013 at 6:33 PM, Dave Taht wrote: > >> On Fri, Jan 4, 2013 at 9:27 AM, Eric Dumazet wrote= : >> > Sorry, could you give us a copy of the panic stack trace ? >> >> I will get a serial console up on a wndr3800 by sunday. (sorry, just >> landed in california, am in disarray) >> >> The latest dev build of cero for the wndr3800 and wndr3700v2 is at: >> >> http://snapon.lab.bufferbloat.net/~cero2/cerowrt/wndr/3.7.1-1/ >> >> -- >> Dave T=C3=A4ht >> >> Fixing bufferbloat with cerowrt: >> http://www.teklibre.com/cerowrt/subscribe.html >> _______________________________________________ >> Cerowrt-devel mailing list >> Cerowrt-devel@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/cerowrt-devel >> > > --f46d0444690951036104d27c881e Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Oops, apologies if email was formatted weirdly...

On Fri, Jan 4, 2013 at 9:42 PM, Maciej Soltysiak <maciej@solty= siak.com> wrote:
I am seeing something strange here, with polipo relat= ed to TFO but also DNS.
When I just took 3.7.1-1 and set my windows 7 laptop to us= e gw.home.lan:8123 as http proxy it didn't work. What I observed was:
A) after quite a while polipo's response to browser was 504 = Host www.osnews.com= lookup failed: Timeout
b) this error in ssh console: Host= osnews.com lookup fail= ed: Timeout (131072)
c) Disabling TFO by adding option useTCPFastOpen 'false' to co= nfig 'polipo' 'general' works around the problem
= d) Alternatively, you can keep TFO enabled in polipo but change option '= ;dnsUseGethostbyname' from 'reluctantly' to 'true' (!)<= /div>
This is very weird, because TFO is TCP and the DNS queries= fired off by polipo are UDP:
root@OpenWrt:/tmp/log# tcpdump -n = -v -vv -vvv -x -X -s 1500 -i lo
20:21:56.160245 IP (tos 0x0, ttl 64, id 50129, offset 0, flags [DF], p= roto UDP (17), length 60)
127.0.0.1.47304 > 127.0.0.1.53: [bad ud= p cksum 0xfe3b -> 0xd17f!] 55396+ A? www.osnews.com. (32)
0x0000: 4500 003c c3d1 4000 4011 78dd 7f00 0001 E..<..@.@.x.....
0x0010: 7f0= 0 0001 b8c8 0035 0028 fe3b d864 0100 .......5.(.;.d..
0x0020: = 0001 0000 0000 0000 0377 7777 066f 736e .........www.osn
0x0030: 6577 7303 636f 6d00 0001 0001 ews.com.....
2= 0:21:56.160319 IP (tos 0x0, ttl 64, id 50130, offset 0, flags [DF], proto U= DP (17), length 60)
127.0.0.1.47304 > 127.0.0.1.53: [bad udp cksu= m 0xfe3b -> 0xd164!] 55396+ AAAA? www.osnews.com. (32)
0x0000: 4500 003c c3d2 4000 4011 78dc 7f00 0001 E..<..@.@.x.....
0x0010: 7f0= 0 0001 b8c8 0035 0028 fe3b d864 0100 .......5.(.;.d..
0x0020: = 0001 0000 0000 0000 0377 7777 066f 736e .........www.osn
0x0030: 6577 7303 636f 6d00 001c 0001 ews.com.....
2= 0:21:56.169942 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (= 17), length 123)
127.0.0.1.53 > 127.0.0.1.47304: [bad udp cksum 0= xfe7a -> 0x5f73!] 55396 q: A? www.osnews.com. 1/2/0 www.osnews.com. [29m3s] A 74.86.31.159 ns: osnews.com. [29m3s] NS ns2.swelter.net., osnews.com. [29m3s] NS ns1.swelter.net. (95)
0x0000: 4500 007b 0000 4000 4011 3c70 7f00 0001 E..{..@.@.<p....
0x0= 010: 7f00 0001 0035 b8c8 0067 fe7a d864 8180 .....5...g.z.d..
= 0x0020: 0001 0001 0002 0000 0377 7777 066f 736e .........www.osn
0x0030: 6577 7303 636f 6d00 0001 0001 c00c 0001 ews.com.........<= br> 0x0040: 0001 0000 06cf 0004 4a56 1f9f c010 0002 ........JV....= ..
0x0050: 0001 0000 06cf 0011 036e 7332 0773 7765 .........ns= 2.swe
0x0060: 6c74 6572 036e 6574 00c0 1000 0200 0100 lter.net........<= br> 0x0070: 0006 cf00 0603 6e73 31c0 40 ......ns1.@20:21:56.173901 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP= (17), length 135)
127.0.0.1.53 > 127.0.0.1.47304: [bad udp cksum 0xfe86 -> 0x8ecb!]= 55396 q: AAAA? www.os= news.com. 1/2/0 ww= w.osnews.com. [54m44s] AAAA 2607:f0d0:1002:62::3 ns: osnews.com. [29m3s] NS ns1.swelter.net., osnews.com. [29m3s] NS ns2.swelter.net. (107)
0x0000: 4500 0087 0000 4000 4011 3c64 7f00 0001 E.....@.@.<d....
0x001= 0: 7f00 0001 0035 b8c8 0073 fe86 d864 8180 .....5...s...d..
0x= 0020: 0001 0001 0002 0000 0377 7777 066f 736e .........www.osn
0x0030: 6577 7303 636f 6d00 001c 0001 c00c 001c ews.com.........<= br> 0x0040: 0001 0000 0cd4 0010 2607 f0d0 1002 0062 ........&.= .....b
0x0050: 0000 0000 0000 0003 c010 0002 0001 0000 .......= .........
0x0060: 06cf 0011 036e 7331 0773 7765 6c74 6572 .....ns1.swelter<= br> 0x0070: 036e 6574 00c0 1000 0200 0100 0006 cf00 .net..........= ..
0x0080: 0603 6e73 32c0 4c ..ns2.L
This is the only DNS traffic I saw during the attempts. The tcpd= umps have udp bad checksum but when I disabled TFO in polipo, the UDP where= still bad checksum but they worked.
Really weird.
p.s. UPNP still works for port forwarding negotiation as it did = in 3.6.11-4
I still couldn't get the UPNP/SSDP broadcasts (ud= p to 239.255.255.250) to being forwarded between se00 and sw00/sw10. Last t= ime it worked was ~3.3.8. I'm starting not to question why it doesn'= ;t work, I'm starting to wonder why it did work then ;-)
Regards,
Maciej
On Fri, Jan 4, 2013 at = 6:33 PM, Dave Taht <dave.taht@gmail.com> wrote:


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