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I am using squid 3.5 for windows as a transparent proxy to provide internet access to 7 servers in a secure environment that otherwise does not have internet access. I have two squids running behind a load balancer, each one is running
server 2016 core with 2 Xeon processors that is either haswell generation with 1:1 physical processor to virtual processor mapping or a hyper-threading Broadwell generation processor that is 1:1 logical processor to virtual processor mapping, depending on
how they are provisioned when they get started. Doing a bandwidth test directly in the VM I am able to get internet throughput of 800-1200 Mbps. Doing a file copy to and from the VM I am able to get 1200 Mbps lan throughput. In proxied uploads I have observed speeds as high as 120 Mbps, which is more than enough for what I need and the bottleneck is likely in the backup software rather than squid. Uploads performance I am not worried about where they are at
now – even if I only got 20-30 Mbps it would be adequate for what I need it for. Downloads however are very slow. Small files do not seem to be impacted. Using the test a thinkbroadband.com/download, files up to 20 Mb will download at a reasonable 20-30 Mbps, but when I get to 50, it slows down to about 17 Mbps, and
when I download AD Connect from Microsoft, which is about 80 Mb, I can see it start at about 30 Mbps, but eventually goes down to about 115 kbps and levels off. When I put an IP on the server I am using for testing that proxies through squid, I am able to
download the file at several hundred mbps. When I download the same file on the squid server – I can’t tell exactly what throughput I was getting, but the 80 Mb file downloaded within 5 seconds. In both squid servers, other than when the servers were booting, processor activity has not exceeded 9% in the last 7 days but usually sits below 2%. Memory usage has not exceeded 2 Gb, leaving 2 Gb free. I am using OpenDNS for a DNS source, and have tried changing DNS to level3 but it made no performance difference. I think that this may be squid trying to cache something, but had tried to turn all caching off. My cache.log doesn’t really have anything interesting in it that I can see. It’s the same ~30 or so log entries each time the service starts, and that is about it. Here it is:
2018/03/22 09:47:27 kid1| Set Current Directory to /var/cache/squid 2018/03/22 09:47:27 kid1| Starting Squid Cache version 3.5.27 for x86_64-unknown-cygwin... 2018/03/22 09:47:27 kid1| Service Name: squid 2018/03/22 09:47:27 kid1| Process ID 1164 2018/03/22 09:47:27 kid1| Process Roles: worker 2018/03/22 09:47:27 kid1| With 3200 file descriptors available 2018/03/22 09:47:27 kid1| Initializing IP Cache... 2018/03/22 09:47:27 kid1| parseEtcHosts: /etc/hosts: (2) No such file or directory 2018/03/22 09:47:27 kid1| DNS Socket created at [::], FD 5 2018/03/22 09:47:27 kid1| DNS Socket created at 0.0.0.0, FD 6 2018/03/22 09:47:27 kid1| Adding nameserver 208.67.222.222 from squid.conf 2018/03/22 09:47:27 kid1| Adding nameserver 208.67.220.220 from squid.conf 2018/03/22 09:47:27 kid1| Logfile: opening log daemon:/var/log/squid/access.log 2018/03/22 09:47:27 kid1| Logfile Daemon: opening log /var/log/squid/access.log 2018/03/22 09:47:27 kid1| WARNING: no_suid: setuid(0): (22) Invalid argument 2018/03/22 09:47:27 kid1| Store logging disabled 2018/03/22 09:47:27 kid1| Swap maxSize 0 + 262144 KB, estimated 20164 objects 2018/03/22 09:47:27 kid1| Target number of buckets: 1008 2018/03/22 09:47:27 kid1| Using 8192 Store buckets 2018/03/22 09:47:27 kid1| Max Mem size: 262144 KB 2018/03/22 09:47:27 kid1| Max Swap size: 0 KB 2018/03/22 09:47:27 kid1| Using Least Load store dir selection 2018/03/22 09:47:27 kid1| Set Current Directory to /var/cache/squid 2018/03/22 09:47:27 kid1| Finished loading MIME types and icons. 2018/03/22 09:47:27 kid1| HTCP Disabled. 2018/03/22 09:47:27 kid1| Squid plugin modules loaded: 0 2018/03/22 09:47:27 kid1| Adaptation support is off. 2018/03/22 09:47:27 kid1| Accepting HTTP Socket connections at local=[::]:3128 remote=[::] FD 10 flags=9 2018/03/22 09:47:28 kid1| storeLateRelease: released 0 objects And this is my squid.conf: # # Recommended minimum configuration: # # Example rule allowing access from your local networks. # Adapt to list your (internal) IP networks from where browsing # should be allowed #acl localnet src 10.0.0.0/8 # RFC1918 possible internal network #acl localnet src 172.16.0.0/12 # RFC1918 possible internal network #acl localnet src 192.168.0.0/16 # RFC1918 possible internal network acl localnet src fc00::/7 # RFC 4193 local private network range acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines acl WSUS src 192.168.225.4/32 acl BACKUP src 192.168.225.11/32 acl ADFS src 192.168.224.7/32 acl ADFS src 192.168.228.8/32 acl DEVWEB src 192.168.226.6/32 acl UATWEB src 192.168.226.13/32 acl PRDWEB src 192.168.226.8/32 acl PRDWEB src 192.168.226.9/32 acl SSL_ports port 443 acl Safe_ports port 80 # http #acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https #acl Safe_ports port 70 # gopher #acl Safe_ports port 210 # wais #acl Safe_ports port 1025-65535 # unregistered ports #acl Safe_ports port 280 # http-mgmt #acl Safe_ports port 488 # gss-http #acl Safe_ports port 591 # filemaker #acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT # # Recommended minimum Access Permission configuration: # # Only allow cachemgr access from localhost #http_access allow localhost manager #http_access deny manager # Deny requests to certain unsafe ports http_access deny !Safe_ports # Deny CONNECT to other than secure SSL ports http_access deny CONNECT !SSL_ports # We strongly recommend the following be uncommented to protect innocent # web applications running on the proxy server who think the only # one who can access services on "localhost" is a local user #http_access deny to_localhost # # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS # # Example rule allowing access from your local networks. # Adapt localnet in the ACL section to list your (internal) IP networks # from where browsing should be allowed http_access allow localnet http_access allow localhost http_access allow WSUS http_access allow ADFS http_access allow BACKUP http_access allow DEVWEB http_access allow UATWEB http_access allow PRDWEB # And finally deny all other access to this proxy http_access deny all # Squid normally listens to port 3128 http_port 3128 # Uncomment the line below to enable disk caching - path format is /cygdrive/<full path to cache folder>, i.e. #cache_dir aufs /cygdrive/d/squid/cache 3000 16 256 cache deny all # Leave coredumps in the first cache dir coredump_dir /var/cache/squid # Add any of your own refresh_pattern entries above these. refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320 dns_nameservers 208.67.222.222 208.67.220.220 max_filedescriptors 3200 Does anyone see anything I am missing here? My access.log doesn’t really have anything interesting in it either, it just looks like it is working normally. I can attach that too if anyone wants to look at it after I redact some of the hosts. Keith Hartley Network Engineer II MCSE: Productivity, MCSA: Server 2008, 2012, Office 365
| Certified Meraki Network Associate, Security+ Geocent, LLC o:
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