[squid-users] "NF getsockopt(SO_ORIGINAL_DST)" filling cache.log due to AWS ELB healthchecks

[Eliezer Croitoru]

Hey John,

I am pretty sure it is something in the AWS Linux kernel.

In any case you should have some http_port without intercept in the config.
As an example add "http_port 127.0.0.1:13333" but I am not sure how it 
was on squid 3.1.10, I know it is mandatory since for 3.4.

If you can test the same settings on an Ubuntu 14.04 server and not AWS 
Linux it would help much to make sure it's either an AWS Linux specific 
issue or something else.

All The Bests,
Eliezer

On 29/10/2015 00:51, John Smith wrote:
> hi,
>
> I have a working(?) squid 3.10 proxy configuration.
> squid-3.1.10-29.18.amzn1.x86_64 on AWS Linux behind an AWS elastic load
> balancer.
>
> My problem is that it appears every single AWS elastic load balancer
> healthcheck triggers a line like this in cache.log:
> 2015/10/28 22:35:10| IpIntercept.cc(137) NetfilterInterception:  NF
> getsockopt(SO_ORIGINAL_DST) failed on FD 14: (92) Protocol not available
>
> I have determined that if I removed the 'intercept' option from our
> http_port 3128, we no longer get the warning messages in cache.log, but
> squid also no longer functions as we want it to...
>
> How do we resolve this?'
> Thanks!
>
> My squid.conf:
>
> #
> # Recommended minimum configuration:
> #
> acl manager proto cache_object
> acl localhost src 127.0.0.1/32 ::1
> acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
>
> # 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 httpacl port 80
> 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 manager localhost
> 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
> #
>
> negative_ttl 3600 seconds
>
> # 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
>
> # And finally deny all other access to this proxy
> http_access deny all
>
> # Squid normally listens to port 3128
>
> http_port 3128 intercept
>
> # We recommend you to use at least the following line.
> hierarchy_stoplist cgi-bin ?
>
> # Uncomment and adjust the following to add a disk cache directory.
> cache_dir ufs /squid1 30720 16 256
> cache_dir ufs /squid2 30720 16 256
> cache_mem 10 GB
> access_log /logs/squid/access.log
> cache_log /logs/squid/cache.log
>
> # Leave coredumps in the first cache dir
> coredump_dir /var/spool/squid
>
> visible_hostname l1
>
> # Add any of your own refresh_pattern entries above these.
> refresh_pattern -i \.(html|htm|css|js)$ 1440 40% 259200
> refresh_pattern -i \.(gif|png|jpg|jpeg|ico|otf|woff|eot|ttf|svg)$ 10080 90%
> 259200 override-expire ignore-no-cache ignore-no-store ignore-private
> 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
>
> cache_peer l2proxy  parent 80 0 no-query no-digest name=http_peer
> cache_peer_access http_peer allow httpacl
> cache_peer l2proxy parent 3129 0 no-query no-digest name=https_peer
> cache_peer_access https_peer deny httpacl
> never_direct allow all
>
>
>
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