Re: Good Stuff [was] Re: shameful-cabling gallery of infamy - does anybody know where it went?
On 9/12/07, Ross Vandegrift [EMAIL PROTECTED] wrote: On Wed, Sep 12, 2007 at 08:36:45AM -0400, Joe Abley wrote: This (the general subject of how to keep real-world cabinets tidy and do cabling in a sane way) seems like an excellent topic for a NANOG tutorial. I'd come, for sure :-) This is a topic that I am quite interested in. I have no telco background, but got started in a shop on par with many of these photos. Around my current job, I'm the guy who is known for whining about crappy cabling jobs. Does anyone know if any good resources on best-practices at this sort of thing? I'm pretty sure that others must've already figured out the trickier stuff that I've thought about. Telcordia. There are age old standards that are related to CO construction and service delivery. In most non ILEC facilities, Bellcore/Telcordia standards are hybrid. Two of the best hybrid implementations I've worked with are Level(3) and MCI. For example - some of the posted pictures show the use of fiber ducts lifted above cable ladders. Why opt for such a two-level design instead of bundling fibers in flex-conduit and running the conduits adjacent on the ladder? I'm not sure what you mean. If you are talking about ladder separation and fiber trough, there are multiple, solid, engineering reasons. The optical trough is used so that you don't need to touch bundle and potentially cause an larger outage with damage. The trough allows fast service delivery of xcons as well. Third tier bundle is used as simple a path route, never to be modified, generally a route from the OSP/ISP termination to splice shelving. If you have access to Level(3) facilities, walk around a bit and look. IMHO, they have the ultimate hybrid CO/datacenter hybrid design. -M
Re: Good Stuff [was] Re: shameful-cabling gallery of infamy - does anybody know
Cabling Installatin Maintenance Magazine Sounds like a fascinating read ;-) Frank Coluccio wrote: Article: Abandoned Cable Removal A Dogged Challenge For All Cabling Installatin Maintenance Magazine By Patrick McLaughlin | July 2007 Issue http://preview.tinyurl.com/32cfak -- As an aside, legend has it that some of the larger skyscrapers in NY City would crumble under the weight of the cables installed inside them --particularly coaxial and proprietary mutli-pair cable runs that were used for market data services and desktop video displays prior to the proliferation of Ethernet over fiber backbones-- running up and down vertical riser shafts, were it not for the bracing and additional structural supports installed after the fact to support them. Frank ---
abandon cable the price of copper
this might be a revenue stream ... --bill
Re: abandon cable the price of copper
Perhaps this paper from this month's Review of Network Economics ( http://www.rnejournal.com/articles/bernstein_et_al_RNE_sep_2007.pdf) on the irreversibility of telecoms investments isn't as clear as we thought. On 9/13/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: this might be a revenue stream ... --bill
McLeod USA SIP Trunking Outage
FYI, McLeod USA is currently experiencing a voice outage on the majority of their VOIP platform, including the DYIA Dynamic Internet Access hybrid voice/data platform. There is no ETR. --- [This E-mail scanned for viruses by Declude Virus]
Anyone using uvlan out there?
A few weeks ago, I stumbled across uvlan... I first thought WTF, then upon researching it a little more, I'm starting to really like the idea for replacing a traditional VPN between sites etc. From the web site: uvlan is a User-space Virtual Local Area Network. In other words, uvlan peers act as nodes on a network switch. Routing ethernet traffic between peers inteligently. Thus allowing for multiple networks to share resources and even IP address space. Some may call it a VPN (Virtual Private Network) application, but it's much more powerful. Differences with traditional VPN technology: 1. It is peer-to-peer 2. It doesn't require licensing 3. It is much simpler 4. It operates at Layer-2 (Ethernet), VPNs generally operate at Layer-3 (IP) Layer-2 applications like gaming can't be supported with Layer-3 tunneling. How does it work? Using the libpcap (winpcap for windows users) library, uvlan listens to a specific ethernet device. If a broadcast frame is seen, then it is sent off to all the peers so they can add it to their records and emit the broadcast on their local network. Once this happens, the device (computer, router, gaming console, etc) which sent the broadcast will be known by all the peers and remote machines will know of the device's existance and how to route traffic to it. This behaviour is identical to a hardware switch. Only difference is - this switch is software and the backplane (the medium that passes information between switch ports) is encrypted packets on the internet. From my understanding, this software is pretty much acting like a bridge, but with endpoints over a routed IP network. Has anyone actually used this? Thoughts? Criticisms? -- Steven Haigh Email: [EMAIL PROTECTED] Web: http://www.crc.id.au Phone: (03) 90001 6090 - 0412 935 897
Re: Anyone using uvlan out there?
How does it work? Using the libpcap (winpcap for windows users) library, uvlan listens to a specific ethernet device. If a broadcast frame is seen, then it is sent off to all the peers so they can add it to their records and emit the broadcast on their local network. Once this happens, the device (computer, router, gaming console, etc) which sent the broadcast will be known by all the peers and remote machines will know of the device's existance and how to route traffic to it. I'd be very concerned if you had a lot of machines running on the same side of a hardware switch and all were nodes... they'd replicate all the broadcast frames and n^2 plus the hardware switch's contribution :). Sounds like a problem for machines that are reasonably close together and/or large implementations of these. Kind of cool otherwise. Deepak
Re: Anyone using uvlan out there?
On Fri, Sep 14, 2007 at 07:35:26AM +1000, Steven Haigh wrote: From the web site: uvlan is a User-space Virtual Local Area Network. In other words, uvlan peers act as nodes on a network switch. Routing ethernet traffic between peers inteligently. Thus allowing for multiple networks to share resources and even IP address space. Some may call it a VPN (Virtual Private Network) application, but it's much more powerful. Differences with traditional VPN technology: It's a VPN. None of these supposed differences are different from the fundamental characteristics of a VPN: 1. It is peer-to-peer invoke_buzzword_of_the_month(); 2. It doesn't require licensing Plenty of VPN products out there are FOSS; 3. It is much simpler Simpler than what? 4. It operates at Layer-2 (Ethernet), VPNs generally operate at Layer-3 (IP) Generally, perhaps, but it's not a requirement of the term VPN that it be an L3 transition. Layer-2 applications like gaming can't be supported with Layer-3 tunneling. Plenty of games can successfully use IP. From my understanding, this software is pretty much acting like a bridge, but with endpoints over a routed IP network. Has anyone actually used this? Thoughts? Criticisms? I haven't used this particular software, but I've used OpenVPN (software of the Gods, by gum) in it's L2 mode, and it's OK as long as you observe all of the usual restrictions on LAN-like traffic over a low-bandwidth, high-latency link. Most things that need to use Ethernet assume all sorts of things that just don't hold over the Internet, and it causes some painful hassles. But, engineered properly, in the correct circumstances, it can be handy to bridge two or more segments over a routed network. A criticism of uvlan in particular is that I wouldn't trust my network security to people who sound so clueless. Their derision of VPNs, as you quoted above, shows either a lack of sense or a blind hatred, using libpcap in this situation gave me some chuckles, and their What algorithms are used? page scares me a little. I'll stick with OpenVPN, myself. Phone: (03) 90001 6090 - 0412 935 897 Gee you Melbournians are advanced... you've already gone to 11 digit phone numbers... grin - Matt
Re: Anyone using uvlan out there?
Quoting Matt Palmer [EMAIL PROTECTED]: On Fri, Sep 14, 2007 at 07:35:26AM +1000, Steven Haigh wrote: From the web site: uvlan is a User-space Virtual Local Area Network. In other words, uvlan peers act as nodes on a network switch. Routing ethernet traffic between peers inteligently. Thus allowing for multiple networks to share resources and even IP address space. Some may call it a VPN (Virtual Private Network) application, but it's much more powerful. Differences with traditional VPN technology: It's a VPN. None of these supposed differences are different from the fundamental characteristics of a VPN: 1. It is peer-to-peer invoke_buzzword_of_the_month(); Yeah - I don't quite agree with this in the traditional P2P sense, however I think they mean that they can connect multiple sites and have data transit between them. I'll cut them a break here because it's hard to describe how it works in so few words :) 2. It doesn't require licensing Plenty of VPN products out there are FOSS; Yeah - I wasn't too sure about this either. I haven't seen any VPN software that requires licensing in years. I didn't know anyone still required this? 3. It is much simpler Simpler than what? Routing? 4. It operates at Layer-2 (Ethernet), VPNs generally operate at Layer-3 (IP) Generally, perhaps, but it's not a requirement of the term VPN that it be an L3 transition. Layer-2 applications like gaming can't be supported with Layer-3 tunneling. Plenty of games can successfully use IP. I was thinking more the case of joining lans. Obviously its not a solution for all causes, as anything with more than 5-10 nodes per site and more than 2-3 sites would get pretty ugly. I think a nice thing would be for things that can ONLY use a local LAN due to either software or developer restrictions. From my understanding, this software is pretty much acting like a bridge, but with endpoints over a routed IP network. Has anyone actually used this? Thoughts? Criticisms? I haven't used this particular software, but I've used OpenVPN (software of the Gods, by gum) in it's L2 mode, and it's OK as long as you observe all of the usual restrictions on LAN-like traffic over a low-bandwidth, high-latency link. Most things that need to use Ethernet assume all sorts of things that just don't hold over the Internet, and it causes some painful hassles. But, engineered properly, in the correct circumstances, it can be handy to bridge two or more segments over a routed network. I've used a lot of VPN stuff in the past, but I've usually always ended up doing it on a router, then had to NAT over it and all sorts of nasty stuff. I think this is a nicer solution if it could be implemented right :) A criticism of uvlan in particular is that I wouldn't trust my network security to people who sound so clueless. Their derision of VPNs, as you quoted above, shows either a lack of sense or a blind hatred, using libpcap in this situation gave me some chuckles, and their What algorithms are used? page scares me a little. I'll stick with OpenVPN, myself. I think it's come about of a case of wanting to do stuff that won't work properly over a routed network (xbox games etc) - however could be nicer for a lot more things. Phone: (03) 90001 6090 - 0412 935 897 Gee you Melbournians are advanced... you've already gone to 11 digit phone numbers... grin Damn typos. I've just changed numbers, I must have typo'ed it when updating the sig on my desktop. At least it's right in other places ;) -- Steven Haigh Email: [EMAIL PROTECTED] Web: http://www.crc.id.au Phone: (03) 9001 6090 - 0412 935 897
Re: Anyone using uvlan out there?
On Fri, Sep 14, 2007 at 12:33:03PM +1000, Steven Haigh wrote: Quoting Matt Palmer [EMAIL PROTECTED]: On Fri, Sep 14, 2007 at 07:35:26AM +1000, Steven Haigh wrote: 2. It doesn't require licensing Plenty of VPN products out there are FOSS; Yeah - I wasn't too sure about this either. I haven't seen any VPN software that requires licensing in years. I didn't know anyone still required this? There's plenty of lots-o-money VPN products out there; presumably that's what they're talking about. The problem is that the statement uvlan isn't a VPN because it doesn't require licencing is a ridiculous statement, because you don't have to have a licencing requirement to be a VPN. 3. It is much simpler Simpler than what? Routing? Simple is in the eye of the beholder. Switched ethernet networks have their complexities that routed networks don't... 4. It operates at Layer-2 (Ethernet), VPNs generally operate at Layer-3 (IP) Generally, perhaps, but it's not a requirement of the term VPN that it be an L3 transition. Layer-2 applications like gaming can't be supported with Layer-3 tunneling. Plenty of games can successfully use IP. I was thinking more the case of joining lans. Obviously its not a solution for all causes, as anything with more than 5-10 nodes per site and more than 2-3 sites would get pretty ugly. I think a nice thing would be for things that can ONLY use a local LAN due to either software or developer restrictions. Well, obviously. From my understanding, this software is pretty much acting like a bridge, but with endpoints over a routed IP network. Has anyone actually used this? Thoughts? Criticisms? I haven't used this particular software, but I've used OpenVPN (software of the Gods, by gum) in it's L2 mode, and it's OK as long as you observe all of the usual restrictions on LAN-like traffic over a low-bandwidth, high-latency link. Most things that need to use Ethernet assume all sorts of things that just don't hold over the Internet, and it causes some painful hassles. But, engineered properly, in the correct circumstances, it can be handy to bridge two or more segments over a routed network. I've used a lot of VPN stuff in the past, but I've usually always ended up doing it on a router, then had to NAT over it and all sorts of nasty stuff. I think this is a nicer solution if it could be implemented right :) I don't think you quite got my point -- you *don't* need uvlan to bridge Ethernet segments over a routed network; there are other products which will do the same thing. As I said, I've used OpenVPN to do this job, and my experiences are given in that block of text you quoted. A criticism of uvlan in particular is that I wouldn't trust my network security to people who sound so clueless. Their derision of VPNs, as you quoted above, shows either a lack of sense or a blind hatred, using libpcap in this situation gave me some chuckles, and their What algorithms are used? page scares me a little. I'll stick with OpenVPN, myself. I think it's come about of a case of wanting to do stuff that won't work properly over a routed network (xbox games etc) - however could be nicer for a lot more things. XBox games don't work over a routed network? Please tell me that XBox Live isn't just a giant uvlan install. - Matt -- When the revolution comes, they won't be able to FIND the wall. -- Brian Kantor, in the Monastery
Re: Anyone using uvlan out there?
On Fri, 14 Sep 2007, Steven Haigh wrote: From my understanding, this software is pretty much acting like a bridge, but with endpoints over a routed IP network. So its like l2tpv3 vpn. And, since its based on PC platform, I kind of have to say, in words of Vijay, It does not scale, and What problem is being solved? -alex [not mlc anything]
