[NANOG] Introducing latency for testing?
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes? Thanks in advance. -Mike
setup a linux box between the systems with netem (included in most distros). http://www.linux-foundation.org/en/Net:Netem with it, you can introduce latency, loss, jitter, etc. tate Mike Lyon wrote:
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes?
Thanks in advance.
-Mike
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Or a FreeBSD box with DUMMYNET (runs through IPFW). You can do all of that stuff. C. Tate Baumrucker wrote:
setup a linux box between the systems with netem (included in most distros). http://www.linux-foundation.org/en/Net:Netem with it, you can introduce latency, loss, jitter, etc. tate
Mike Lyon wrote:
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes?
Thanks in advance.
-Mike
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Thank you all for the wonderful responses! Cheers, Mike On Fri, May 2, 2008 at 1:27 PM, Deepak Jain <deepak@ai.net> wrote:
Or a FreeBSD box with DUMMYNET (runs through IPFW). You can do all of that stuff.
C. Tate Baumrucker wrote:
setup a linux box between the systems with netem (included in most distros). http://www.linux-foundation.org/en/Net:Netem with it, you can introduce latency, loss, jitter, etc. tate
Mike Lyon wrote:
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes?
Thanks in advance.
-Mike
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NISTnet at http://snad.ncsl.nist.gov/nistnet/ Also, there is a commercial (reasonably priced) product called network nightmare. (http://networknightmare.net/) Cisco also has an .iso that they'll give to customers that's a NISTnet livecd. -Geoff On Fri, May 2, 2008 at 4:12 PM, Mike Lyon <mike.lyon@gmail.com> wrote:
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes?
Thanks in advance.
-Mike
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On Fri, May 02, 2008 at 01:12:52PM -0700, Mike Lyon <mike.lyon@gmail.com> wrote a message of 15 lines which said:
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes?
I use and like FreeBSD's dummynet: http://info.iet.unipi.it/~luigi/ip_dummynet/ Highly recommended.
The freebsd dummynet driver is all about latency simulation... http://www.scalabledesign.com/articles/dummynet.html linux has a netem which can do the same thing http://www.linux-foundation.org/en/Net:Netem joelja Mike Lyon wrote:
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes?
Thanks in advance.
-Mike
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Joel Jaeggli (joelja) writes:
The freebsd dummynet driver is all about latency simulation...
http://www.scalabledesign.com/articles/dummynet.html
linux has a netem which can do the same thing
dummynet is significantly easier to set up, especially for doing things like random packet reordering / packet loss (using the 'prob' rule of ipfw + delay property with pipes). ipfw pipe 42 config bw 1024Kbit/s delay 6ms ipfw pipe 666 config bw 64Kbit/s delay 350ms ipfw add 10 prob 0.05 deny ip from 1.2.3.4 to any ipfw add 10 prob 0.8 pipe 666 ip from A to B ipfw add 10 prob 0.5 pipe 42 ip from A to B ... and it runs.
It's not free, but at a recent trade show I did see what appeared to be an affordable unit from Apposite Technologies (apposite-tech.com). And there's always PacketStorm. Frank -----Original Message----- From: Mike Lyon [mailto:mike.lyon@gmail.com] Sent: Friday, May 02, 2008 3:13 PM To: NANOG Subject: [NANOG] Introducing latency for testing? So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes? Thanks in advance. -Mike _______________________________________________ NANOG mailing list NANOG@nanog.org http://mailman.nanog.org/mailman/listinfo/nanog
Frank Bulk - iNAME wrote:
It's not free, but at a recent trade show I did see what appeared to be an affordable unit from Apposite Technologies (apposite-tech.com). And there's always PacketStorm.
Frank
-----Original Message----- From: Mike Lyon [mailto:mike.lyon@gmail.com] Sent: Friday, May 02, 2008 3:13 PM To: NANOG Subject: [NANOG] Introducing latency for testing?
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes?
Thanks in advance.
-Mike
_______________________________________________ NANOG mailing list NANOG@nanog.org http://mailman.nanog.org/mailman/listinfo/nanog
IIRC ipfw can do this using dummynet and the delay directive. Regards, Chris
Chris Marlatt wrote:
Frank Bulk - iNAME wrote:
It's not free, but at a recent trade show I did see what appeared to be an affordable unit from Apposite Technologies (apposite-tech.com). And there's always PacketStorm.
Frank
-----Original Message----- From: Mike Lyon [mailto:mike.lyon@gmail.com] Sent: Friday, May 02, 2008 3:13 PM To: NANOG Subject: [NANOG] Introducing latency for testing?
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that?
boxes across the globe have the property of being somewhat less deterministic than you'd like if you need repeatability.
IIRC ipfw can do this using dummynet and the delay directive.
it will also do jitter and drop rate... to wit, it's exactly what is need here. there are analogous tools for iptables based platforms.
On Sat, Jun 14, 2008 at 01:34:53PM -0500, Frank Bulk - iNAME wrote:
It's not free, but at a recent trade show I did see what appeared to be an affordable unit from Apposite Technologies (apposite-tech.com). And there's always PacketStorm.
Frank
-----Original Message----- From: Mike Lyon [mailto:mike.lyon@gmail.com] Sent: Friday, May 02, 2008 3:13 PM To: NANOG Subject: [NANOG] Introducing latency for testing?
So I want to mimic some latency in a test network for DB replication. I am wondering what other's have used for this? Obviously, the best way to would be to actually have one box across the US or across the globe to actually test against but what if you don't have that? Are there any GPL software router solutions that would allow you to tweak the latency in between the two test boxes?
There is one interesting box that you can use to simulate the delay at 10GE and do a few other things. http://projects.gtrc.aist.go.jp/gnet/gnet10p3e.html - Jared -- Jared Mauch | pgp key available via finger from jared@puck.nether.net clue++; | http://puck.nether.net/~jared/ My statements are only mine.
participants (10)
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C. Tate Baumrucker -
Chris Marlatt -
Deepak Jain -
Frank Bulk - iNAME -
Geoff Lisk -
Jared Mauch -
Joel Jaeggli -
Mike Lyon -
Phil Regnauld -
Stephane Bortzmeyer