Date: Fri, 19 Apr 2013 09:22:36 +0000 From: "C. L. Martinez" <carlopmart@gmail.com> To: freebsd-net@freebsd.org Subject: Re: Network connections are lost from time to time Message-ID: <CAEjQA5KLTzrOuWrY5Q1Z2yPekyZKcVMW_344kLdh-pxtzxRiBg@mail.gmail.com> In-Reply-To: <CAEjQA5LXuwCO96dkFwyjgXfCiDu%2B4mR7E0cxpy8Uh4pBzsD60Q@mail.gmail.com> References: <CAEjQA5LXuwCO96dkFwyjgXfCiDu%2B4mR7E0cxpy8Uh4pBzsD60Q@mail.gmail.com>
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On Fri, Apr 19, 2013 at 7:11 AM, C. L. Martinez <carlopmart@gmail.com>wrote: > Hi all, > > I have a strange problem with my FreeBSD 9.1 (fully patched): I loose ssh > sessions from time to time frequently. > > This fbsd box is installed in an ESXi 5.1 server and I have another three > fbsd 9.1 in the same ESXi host that do not have this problem, but maybe the > problem is with my sysctl.conf and loader.conf settings: > > sysctl.conf > > # $FreeBSD: release/9.1.0/etc/sysctl.conf 112200 2003-03-13 18:43:50Z mux $ > # > # This file is read when going to multi-user and its contents piped thru > # ``sysctl'' to adjust kernel values. ``man 5 sysctl.conf'' for details. > # > > # Uncomment this to prevent users from seeing information about processes > that > # are being run under another UID. > security.bsd.see_other_uids=0 > security.bsd.see_other_gids=0 > > # Refresh arp table entries in 2 minutes > net.link.ether.inet.max_age=120 > > # Drop tcp/udp packets destined for closed ports > net.inet.tcp.blackhole=2 > net.inet.udp.blackhole=1 > > # Use the H-TCP congestion control algorithm which is more aggressive > ##net.inet.tcp.cc.algorithm=htcp > > # Host cache is used to cache connection details and metrics > ##net.inet.tcp.hostcache.expire=5400 > > # Maximum segment size (MSS) specifies the largest amount of data in a > single TCP segment > net.inet.tcp.mssdflt=1440 > > # Make sure time stamps are enabled for slowstart_flightsize > net.inet.tcp.rfc1323=1 > > # Make sure rfc3390 is DISABLED so the slowstart flightsize values are > used. > net.inet.tcp.rfc3390=0 > > # Size of the TCP transmit and receive buffer. > net.inet.tcp.sendspace=262144 > > # Increase auto-tuning TCP step size of the TCP transmit and receive > buffers. > net.inet.tcp.recvbuf_inc=524288 > > # Somaxconn is the buffer or backlog queue depth for accepting new TCP > connections. > kern.ipc.somaxconn=1024 > > # Reduce the amount of SYN/ACKs we will _retransmit_ to an unresponsive > initial connection. > net.inet.tcp.syncache.rexmtlimit=1 > > # Spoofed packet attacks may be used to overload the kernel route cache. > net.inet.ip.rtexpire=60 > net.inet.ip.rtminexpire=2 > net.inet.ip.rtmaxcache=1024 > > loader.conf: > > ############################################################## > ### Loader settings ######################################## > ############################################################## > > autoboot_delay="5" > beastie_disable="YES" > > > ############################################################## > ### Kernel tunables ######################################## > ############################################################## > > kern.maxfiles="25000" > kern.ipc.nmbclusters="32768" > net.inet.tcp.syncache.hashsize="1024" > net.inet.tcp.syncache.bucketlimit="100" > net.inet.tcp.tcbhashsize="4096" > > > ############################################################## > ### Hardware tunables ###################################### > ############################################################## > > hw.pci.enable_msi="0" > hw.pci.enable_msix="0" > > > ############################################################## > ### Networking modules ##################################### > ############################################################## > > cc_htcp_load="YES" > > > ############################################################## > ### Other modules ########################################## > ############################################################## > > aio_load="YES" > > How can I debug where is the problem?? > More info when I try to connect with PuTTY from a windows desktop appears the following error: Network error: Software caused connection abort. ... and pf is disabled (ipfw and ipfilter, too).
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