<div dir="ltr"><div>Hi Amos,</div><div><br></div><div>You said</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>The traffic from Squid to the AArnet server is apparently using IPv6. Is <br>
that routing setup properly too?</div></blockquote><div><br></div><div>The output of "ip address" shows both IPv4 and IPv6. What led you to make the above conclusion?<br></div><div><br></div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Regards,</div><div><br></div><div><div dir="ltr" style="margin-left:0pt" align="left"><table style="border:none;border-collapse:collapse"><colgroup><col width="181"><col width="229"></colgroup><tbody><tr style="height:0pt"><td style="border-left:solid #ffffff 1pt;border-right:solid #4a86e8 1pt;border-bottom:solid #ffffff 1pt;border-top:solid #ffffff 1pt;vertical-align:top;padding:5pt 5pt 5pt 5pt;overflow:hidden"><p dir="ltr" style="line-height:1.2;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap"><span style="border:none;display:inline-block;overflow:hidden;width:167px;height:130px"><img src="https://lh4.googleusercontent.com/PjzOtuo8wRwonOYtyjVEsTHphPFdwgM8H79UkQ5H--uLWS_Wje0pIvRFGgiiaYF8CohhfacA5LpIBIck7fEou91YR_e95GyEd53ubLzjKbgTVaqvhdESRKKiWZqDxUYAmOApJr47" style="margin-left:0px;margin-top:0px" width="167" height="130"></span></span></p></td><td style="border-left:solid #4a86e8 1pt;border-right:solid #ffffff 1pt;border-bottom:solid #ffffff 1pt;border-top:solid #ffffff 1pt;vertical-align:top;padding:5pt 5pt 5pt 5pt;overflow:hidden"><p dir="ltr" style="line-height:1.728;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11.5pt;font-family:Arial;color:#2e80b5;background-color:transparent;font-weight:700;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap">David Mills</span></p><p dir="ltr" style="line-height:1.728;margin-top:0pt;margin-bottom:0pt"><span style="font-size:9pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap">Senior DevOps Engineer</span></p><br><p dir="ltr" style="line-height:1.44;margin-right:5pt;margin-top:0pt;margin-bottom:5pt"><span style="font-size:9pt;font-family:Arial;color:#3388cc;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap"> </span><span style="font-size:9pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap">E: </span><span style="font-size:9pt;font-family:Arial;color:#2e80b5;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap"><a href="mailto:david.mills@acusensus.com" target="_blank">david.mills@acusensus.com</a></span></p><p dir="ltr" style="line-height:1.44;margin-right:5pt;margin-top:0pt;margin-bottom:5pt"><span style="font-size:9pt;font-family:Arial;color:#3388cc;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap"> </span><span style="font-size:9pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap">M:</span><span style="font-size:9pt;font-family:Arial;color:#3388cc;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap"> </span><span style="font-size:9pt;font-family:Arial;color:#2e80b5;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap">+61 411 513 404</span></p><p dir="ltr" style="line-height:1.44;margin-top:0pt;margin-bottom:0pt"><span style="font-size:9pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap"> W:</span><a href="http://acusensus.com/" style="text-decoration:none" target="_blank"><span style="font-size:9pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:underline;vertical-align:baseline;white-space:pre;white-space:pre-wrap"> </span><span style="font-size:9pt;font-family:Arial;color:#1155cc;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:underline;vertical-align:baseline;white-space:pre;white-space:pre-wrap">acusensus.com</span></a></p><br></td></tr></tbody></table></div><br><br></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 8 Jul 2021 at 12:19, Amos Jeffries <<a href="mailto:squid3@treenet.co.nz">squid3@treenet.co.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<br>
On 8/07/21 11:44 am, David Mills wrote:<br>
> Hi Eliezer,<br>
> <br>
> We have:<br>
> <br>
> /etc/apt/apt.conf:<br>
> <br>
> Acquire::http::proxy<br>
> "<a href="http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/" rel="noreferrer" target="_blank">http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/</a><br>
> <<a href="http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/" rel="noreferrer" target="_blank">http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/</a>>";<br>
> Acquire::https::proxy<br>
> "<a href="http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/" rel="noreferrer" target="_blank">http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/</a><br>
> <<a href="http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/" rel="noreferrer" target="_blank">http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128/</a>>";<br>
> <br>
> <br>
> /etc/apt/sources.list (comment lines removed for brevity)<br>
> <br>
> deb <a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a>> focal main restricted<br>
> deb <a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a>> focal-updates main restricted<br>
> deb <a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a>> focal-updates universe<br>
> deb <a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a>> focal multiverse<br>
> deb <a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a>> focal-updates multiverse<br>
> deb <a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu/" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/</a>> focal-backports main<br>
> restricted universe multiverse<br>
> deb <a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a>> focal-security main restricted<br>
> deb <a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a>> focal-security universe<br>
> deb <a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a>> focal-security multiverse<br>
> <br>
> <br>
> squid.conf<br>
> <br>
...<br>
> #<br>
> # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS<br>
> #<br>
> <br>
> # Redirect HTTP to HTTPS<br>
> acl port_80 port 80<br>
> acl gstatic dstdomain <a href="http://www.gstatic.com" rel="noreferrer" target="_blank">www.gstatic.com</a> <<a href="http://www.gstatic.com" rel="noreferrer" target="_blank">http://www.gstatic.com</a>><br>
> http_access deny port_80 gstatic<br>
> deny_info 301:https://%H%R gstatic<br>
> <br>
> acl avpc dstdomain crop-assessment.acusensus-vpc<br>
> http_access deny port_80 avpc<br>
> deny_info 302:<company url> avpc<br>
> <br>
> <br>
> # Deny HTTP<br>
> http_access deny port_80<br>
> <br>
> # Whitelist of allowed sites<br>
> acl allowed_http_sites dstdomain "/etc/squid/squid.allowed.sites.txt"<br>
> http_access allow allowed_http_sites vpc_cidr<br>
> <br>
<br>
Is the "<a href="http://mirror.aarnet.edu.au" rel="noreferrer" target="_blank">mirror.aarnet.edu.au</a>" or a wildcard matching it listed in file <br>
squid.allowed.sites.txt ?<br>
<br>
(I assume so, but checking in case it is that simple).<br>
<br>
<br>
> # And finally deny all other access to this proxy<br>
> http_access deny all<br>
> <br>
> # Squid normally listens to port 3128<br>
> http_port 3128 ssl-bump cert=/etc/squid/cert.pem<br>
> acl allowed_https_sites ssl::server_name<br>
> "/etc/squid/squid.allowed.sites.txt"<br>
> acl step1 at_step SslBump1<br>
> acl step2 at_step SslBump2<br>
> acl step3 at_step SslBump3<br>
> ssl_bump peek step1 all<br>
> ssl_bump peek step2 allowed_https_sites<br>
> ssl_bump splice step3 allowed_https_sites<br>
> ssl_bump terminate step2 all<br>
> <br>
> # Uncomment and adjust the following to add a disk cache directory.<br>
> #cache_dir ufs /var/spool/squid 100 16 256<br>
> <br>
> # Leave coredumps in the first cache dir<br>
> coredump_dir /var/spool/squid<br>
> #<br>
> # Add any of your own refresh_pattern entries above these.<br>
> #<br>
> refresh_pattern ^ftp: 1440 20% 10080<br>
> refresh_pattern ^gopher: 1440 0% 1440<br>
> refresh_pattern -i (/cgi-bin/|\?) 0 0% 0<br>
> refresh_pattern . 0 20% 4320<br>
> <br>
> <br>
> <br>
> Squid 3.5 is running on an EC2 instance running Amazon Linux 2. I'll <br>
> answer the questions you asked Ben for extra info.<br>
> ip address:<br>
> <br>
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN<br>
> group default qlen 1000<br>
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00<br>
> inet <a href="http://127.0.0.1/8" rel="noreferrer" target="_blank">127.0.0.1/8</a> <<a href="http://127.0.0.1/8" rel="noreferrer" target="_blank">http://127.0.0.1/8</a>> scope host lo<br>
> valid_lft forever preferred_lft forever<br>
> inet6 ::1/128 scope host<br>
> valid_lft forever preferred_lft forever<br>
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state<br>
> UP group default qlen 1000<br>
> link/ether 02:1b:15:b8:9a:06 brd ff:ff:ff:ff:ff:ff<br>
> inet <a href="http://10.0.12.111/24" rel="noreferrer" target="_blank">10.0.12.111/24</a> <<a href="http://10.0.12.111/24" rel="noreferrer" target="_blank">http://10.0.12.111/24</a>> brd 10.0.12.255<br>
> scope global dynamic eth0<br>
> valid_lft 2393sec preferred_lft 2393sec<br>
> inet6 fe80::1b:15ff:feb8:9a06/64 scope link<br>
> valid_lft forever preferred_lft forever<br>
> <br>
> <br>
> ip rule<br>
> <br>
> 0: from all lookup local<br>
> 32766: from all lookup main<br>
> 32767: from all lookup default <br>
> <br>
> <br>
> ip route show<br>
> <br>
> default via 10.0.12.1 dev eth0<br>
> <a href="http://10.0.12.0/24" rel="noreferrer" target="_blank">10.0.12.0/24</a> <<a href="http://10.0.12.0/24" rel="noreferrer" target="_blank">http://10.0.12.0/24</a>> dev eth0 proto kernel scope link<br>
> src 10.0.12.111<br>
> 169.254.169.254 dev eth0<br>
> <br>
> <br>
<br>
<br>
The traffic from Squid to the AArnet server is apparently using IPv6. Is <br>
that routing setup properly too?<br>
<br>
<br>
...<br>
<br>
> From: squid-users On Behalf Of David Mills<br>
> Sent: Wednesday, July 7, 2021 2:26 AM<br>
...<br>
> We have tried upgrading one to 20.04. Same setup. From the command<br>
> line curl or wget can happily download an Ubuntu package from the<br>
> Ubuntu Mirror site we use. But "apt update" gets lots of "IGN:"<br>
> timeouts and errors.<br>
> <br>
> The package we test curl with is<br>
> <a href="https://mirror.aarnet.edu.au/ubuntu/pool/main/c/curl/curl_7.68.0-1ubuntu2.5_amd64.deb" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/pool/main/c/curl/curl_7.68.0-1ubuntu2.5_amd64.deb</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu/pool/main/c/curl/curl_7.68.0-1ubuntu2.5_amd64.deb" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu/pool/main/c/curl/curl_7.68.0-1ubuntu2.5_amd64.deb</a>><br>
> <br>
> The Squid log shows a line the doesn't occur for the successful<br>
> 18.04 "apt updates":<br>
> 1625190959.233 81 10.0.11.191 TAG_NONE/200 0 CONNECT<br>
> <a href="http://mirror.aarnet.edu.au:443" rel="noreferrer" target="_blank">http://mirror.aarnet.edu.au:443</a> <<a href="http://mirror.aarnet.edu.au:443" rel="noreferrer" target="_blank">http://mirror.aarnet.edu.au:443</a>> -<br>
> HIER_DIRECT/2001:388:30bc:cafe::beef -<br>
> <br>
<br>
With Ubuntu 20.04 you should have received Squid-4 (v4.10 or later). <br>
Which logs a few things differently from Squid-3.5, particularly for <br>
SSL-Bump activity and client connections that lack HTTP messages.<br>
<br>
The above log line shows SSL-Bump activity. At least step2 was reached, <br>
possibly also step3. Looking at this a little closer to see if it <br>
completes fine or has unseen issues would be my next point of approach.<br>
<br>
To debug what is happening with SSL-Bump use "debug_options ALL1, 11,2 <br>
83,5" and check the resulting cache.log.<br>
<br>
<br>
<br>
> The full output of an attempt to update is:<br>
> Ign:1 <a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a>> focal InRelease<br>
> Ign:2 <a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a>> focal-updates InRelease<br>
> Ign:3 <a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a>> focal-backports InRelease<br>
> Ign:4 <a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a>> focal-security InRelease<br>
<br>
<br>
These "Ign" are fine. They just mean that apt has determined those files <br>
it has cached are up-to-date and do not need to be re-fetched right now.<br>
<br>
The below "Err" are the problem:<br>
<br>
> Err:5 <a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a><br>
> <<a href="https://mirror.aarnet.edu.au/ubuntu" rel="noreferrer" target="_blank">https://mirror.aarnet.edu.au/ubuntu</a>> focal Release<br>
> Could not wait for server fd - select (11: Resource temporarily<br>
> unavailable) [IP: 10.0.11.82 3128]...<br>
> <br>
> While running, the line<br>
> 0% [Connecting to HTTP proxy<br>
> (<a href="http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128" rel="noreferrer" target="_blank">http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128</a><br>
> <<a href="http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128" rel="noreferrer" target="_blank">http://vpn-proxy-d68aca8a8f7f81d6.elb.ap-southeast-2.amazonaws.com:3128</a>>)]<br>
> appears often and hang for a while.<br>
> <br>
> I've tried upping the squid logging and allowing all, but they<br>
> didn't offer any additional information about the issue.<br>
> <br>
<br>
Your squid.conf looks fine, assuming the same http_access rules were <br>
used in your working version.<br>
<br>
<br>
I suspect the issue is related to one or more of:<br>
<br>
* IPv6 routing<br>
<br>
* ICMP config issues (maybe outside your network)<br>
<br>
* SSL-Bump issues processing the client or server handshake traffic<br>
typically seen with OpenSSL library version or config mismatches <br>
between Squid, client and server.<br>
<br>
* network timeouts affecting Squid<br>
<br>
<br>
HTH<br>
Amos<br>
_______________________________________________<br>
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</blockquote></div>
<br>
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