similar to: new DoS technique (exploiting TCP retransmission timeouts)

Does anyone know the practicality of this attack ? i.e. is this trivial to do ? ---Mike -------------------------------------------------------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet since 1994 www.sentex.net Cambridge, Ontario Canada

Hi, Just got some of the new Soekris 1401 VPN cards based on the hifn 7955 chip. hifn0 mem 0xe8510000-0xe8517fff,0xe8518000-0xe8519fff,0xe851a000-0xe851afff irq 5 at device 0.0 on pci1 hifn0: Hifn 7955, rev 0, 32KB dram, 64 sessions vs hifn0 mem 0xeb902000-0xeb902fff,0xeb901000-0xeb901fff irq 10 at device 8.0 on pci0 hifn0: Hifn 7951, rev 0, 128KB sram, 193 sessions When it says "n

I have a somewhat busy sftp server where the users are all chrooted into their home directory. In order to log all the commands they enter, I have to create a /dev/log entry and hard link in their home directory so that syslog works for their commands Match user * ForceCommand internal-sftp -f local1 -l verbose Everything works, but its a bit of a pain if someone restarts syslogd and forgets

Other than cranking up logging to debug2, is there a way to better tune logging on a server to see if I am running into max sessions ? On FreeBSD RELENG11 I am periodically seeing connections being refused- 3way handshake not completing or completing and then FINs. Typically, I have a hundred or so connections at one time, but they can bounce up to a few hundred on occasion. Without leaving the

On a rather full customer web server, I am trying to track down whose web site script is trying to make outbound network connections when they should not be. In /etc/security/audit_control, I added to the flags line dir:/var/audit flags:lo,aa,-nt minfree:5 to log failed network connection. When I try an make an outbound connection to something that is blocked in pf, it seems to sometimes work.

Any chance someone can look at / commit the fix in PR 52349 before 4.9R ? Its a simple fix. As it is to netstat, I dont know of anyone who 'owns' that program to bug other than to make a general plea :-) ---Mike -------------------------------------------------------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications,

FYI >To: misc@openbsd.org >Subject: FreeBSD hiding security stuff >Date: Fri, 04 Mar 2005 03:51:42 -0700 >From: Theo de Raadt <deraadt@cvs.openbsd.org> > >A few FreeBSD developers apparently have found some security issue >of some sort affecting i386 operating systems in some cases. > >They have refused to give us real details. > >A promise is now being

On 7/24/2017 8:39 PM, Nico Kadel-Garcia wrote: > > Why are the targets of the hardlinks evaporating on rebooting? Is that > a FreeBSD'ism? Its when syslogd stops/starts. The hardlinks need to be recreated for some reason. ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike at sentex.net Providing Internet services since 1994

While trying to speed up nanobsd builds, I mounted /usr/obj on a ramdisk and found my box crashing. Thinking it might be hardware, I tried a separate machine, but with the same results. I have 4G of ram (i386). Am I just running out of some kernel memory ? If so, is there anything I can adjust to prevent this, yet still use mfs in this way ? mdconfig -a -t malloc -s 1800M newfs /dev/md0

I have a TDM400P with some FXO ports, and I wanted to connect the two POTS lines from my Pipeline-75 ISDN router into the FXO interfaces on my Asterisk server. Hooked it up, seemed fine, called in and it answered. The problem is when the call is hung up on, the FXO port never drops. So of course then the P75 just holds the line off hook and you get a busy. So it's good for the first

Hello, I am trying to setup a network of 5 XP computers with roaming profiles. I've got a profile set up on the server and I can log on. The problem is that the log in time takes about 10 mins and the log out takes just as long. Here is a link to the log file from the samba server. I have made comments on it to show what is happening on the terminal.

Hi, I have been trying out a nice new tws controller and decided to enable debugging in the kernel and run some stress tests. With a regular GENERIC kernel, it boots up fine. But with debugging, it panics on boot. Anyone know whats up ? Is this something that should be sent directly to LSI ? pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0 pci0: <ACPI PCI bus> on pcib0

I gave the AMD64 version of 7.2 RC2 a spin and all installed as expected off the dvd INTEL S3200SHV MB, Core2Duo, 4G of RAM In the past it had been suggested that for zfs tuning, something like vm.kmem_size_max="1073741824" vm.kmem_size="1073741824" vfs.zfs.prefetch_disable=1 However doing a simple test with bonnie and dd, there does not seem to be very much difference in

Has anyone around here heard of this ? ---Mike >Subject: Re: [Full-Disclosure] new ssh exploit? >From: christopher neitzert <chris@neitzert.com> >Reply-To: chris@neitzert.com >To: full-disclosure@lists.netsys.com >X-Mailer: Ximian Evolution 1.4.3.99 >Sender: full-disclosure-admin@lists.netsys.com >X-BeenThere: full-disclosure@lists.netsys.com

I wrote a small app that monitors a Back-UPS ES500 UPS via the uhid0 interface. I want to run the daemon with as little privs as possible. gastest# ls -l /dev/uhid0 crw-rw---- 1 root operator 122, 0 Nov 12 05:26 /dev/uhid0 gastest# Is it safe to chmod o+r /dev/uhid0 ? Or is there a better way to drop privs of the daemon yet still be able to read from the device ? All I am doing is

Hello, I have just installed a fresh copy of FreeBSD 4.0-RELEASE on a P75, and want to compile openssh-2.1.1p2, but the compile fails with: gcc -g -O2 -Wall -I/usr/local/ssl/include -DETCDIR=\"/usr/local/etc\" -DSSH_PROGRAM=\"/usr/local/bin/ssh\" -DSSH_ASKPASS_DEFAULT=\"/usr/local/libexec/ssh/ssh-askpass\" -DHAVE_CONFIG_H -c loginrec.c loginrec.c: In function

Does anyone know of a way to rate limit ssh connections from an IP address ? We are starting to see more and more brute force attempts to guess simple passwords "/usr/sbin/inetd -wWl -C 10" is nice for slowing down attempts to services launched via inetd. Is there an equiv method for doing this to sshd? Running from inetd has some issues supposedly. ---Mike

TB --- 2013-02-26 21:23:55 - tinderbox 2.10 running on freebsd-stable.sentex.ca TB --- 2013-02-26 21:23:55 - FreeBSD freebsd-stable.sentex.ca 8.3-STABLE FreeBSD 8.3-STABLE #0: Tue Oct 16 17:37:58 UTC 2012 mdtancsa at freebsd-stable.sentex.ca:/usr/obj/usr/src/sys/server amd64 TB --- 2013-02-26 21:23:55 - starting RELENG_9 tinderbox run for arm/arm TB --- 2013-02-26 21:23:55 - cleaning the

Operating system virtualization is the most effective way to utilize your system resources, jails let you setup isolated mini-systems. Jails are explains well in handbook however, from practical standpoint of view, the presented material is incomplete. The post below setup few scrips that follow handbook's 'Application of Jails' article and enhance with few missing features

http://www.uniras.gov.uk/vuls/2004/236929/index.htm ----Quote---- "The impact of this vulnerability varies by vendor and application, but in some deployment scenarios it is rated critical. Please see the vendor section below for further information. Alternatively contact your vendor for product specific information. If exploited, the vulnerability could allow an attacker to create a