Date: Fri, 19 Apr 2013 09:54:09 +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: <CAEjQA5%2BVtbHDqL5X6jn7rn_yN-%2BoF-MvkJ-a7GOLVhKscV1%2BhQ@mail.gmail.com> In-Reply-To: <CAEjQA5KLTzrOuWrY5Q1Z2yPekyZKcVMW_344kLdh-pxtzxRiBg@mail.gmail.com> References: <CAEjQA5LXuwCO96dkFwyjgXfCiDu%2B4mR7E0cxpy8Uh4pBzsD60Q@mail.gmail.com> <CAEjQA5KLTzrOuWrY5Q1Z2yPekyZKcVMW_344kLdh-pxtzxRiBg@mail.gmail.com>
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On Fri, Apr 19, 2013 at 9:22 AM, C. L. Martinez <carlopmart@gmail.com>wrote:
>
>
>
> 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).
>
>
More info: I have intermittent failures with sendmail:
/var/spool/mqueue (1 request)
-----Q-ID----- --Size-- -----Q-Time-----
------------Sender/Recipient-----------
r3J9o54G022686 243 Fri Apr 19 09:50 <root@domain.com>
(reply: read error from [10.196.0.100])
susor1@domain.com
Total requests: 1
It is really strange ...
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