Date: Fri, 19 Apr 2013 07:11:41 +0000 From: "C. L. Martinez" <carlopmart@gmail.com> To: freebsd-net@freebsd.org Subject: Network connections are lost from time to time Message-ID: <CAEjQA5LXuwCO96dkFwyjgXfCiDu%2B4mR7E0cxpy8Uh4pBzsD60Q@mail.gmail.com>
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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??
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