Re: cross connect reliability
Luke S Crawford wrote: Richard A Steenbergen r...@e-gerbil.net writes: You've never seen a single port go bad on a switch? I can't even count the number of times I've seen that happen. Not that I'm not suggesting the OP wasn't the victim of a human error like unplugging the wrong port and they just lied to him, that happens even more. I know it happens; it's happened to me, and I have probably touched fewer switches than you. Still, from what I can understand, it can be prevented/minimized by the use of a grounded port. from: http://support.3com.com/documents/switches/baseline/3Com-Switch-Family_Safety-Reg-Info.pdf CAUTION: If you want to install the Switch using a Category 5E or Category 6 cable, 3Com recommends that you briefly connect the cable to a grounded port before you connect to the network equipment. If you do not, the cable’s electrostatic discharge (ESD) may damage the Switch's port. You can create a grounded port by connecting all wires at one end of a UTP cable to an earth ground point, and the other end to a female RJ-45 connector located, for example, on a Switch rack or patch panel. The RJ-45 connector is now a grounded port. HP chassis switches ship with a grounding jack accessory you attach to the DB9 port (I assume it ties all RJ-45 pins to shied/ground) explicitly for this purpose. The instructions say to always plug a cable into the grounding device before connecting to a switch port. ~Seth
Re: Multi-homed implementation and BGP convergence time
On 11 Sep 2009, at 21:54, andrew.clayba...@securian.com wrote: Hello - my company currently has two connections with a single tier 1 ISP. We are using the AS from our ISP at this time. In the next month we will be implementing a third connection with a second tier 1 ISP, so we will now be using our own AS number on all three routers. Does this mean that right now, you BGP peer with your ISP on a private ASN which they have given you ? I also assume that you have your own PI, and that you are not deaggregating some of your providers' addressing My question is when we implement the new connection and update our existing connections to use are own AS number, how much downtime will there be? So far the second ISP has only said that it could be hours for BGP to fully converge. We are looking for more detail about how long the outage will be and how widespread. It will be hours if you don't plan the work in advance, but if you partner with someone who rolls this stuff out all of the time to plan and execute the work, then there will be a short amount of downtime. If your kit supports local-as, then I would roll this out in a few phases. - Migrate to your new ASN for ibgp, use local-as to announce via the old asn on your ebgp session with ISP1. This is the bit where the service disruption will be. By keeping the scope of this window small, you increase the chances of this disruptive maintenance working fine. - Turn up isp2. Test, thoroughly. - Migrate isp1 from the private asn to your new public asn. All traffic should pass through isp2, so disruption should be limited. Test, thoroughly. Will it be relatively short to our customers that are on one of the ISPs we are directly connected to? Is downtime less for customers on other tier 1 ISPs versus tier 2, etc. ISPs? Downtime is less the more competent your ISP. :-) Tierness is not a measure of this. Sorry for the late reply, if this still needs to be rolled out, then we can help. Best wishes Andy -- Regards, Andy Davidson +44 (0)20 7993 1700 www.netsumo.com NetSumo Specialist networks consultancy for ISPs, Whitelabel 24/7 NOC /* Opinions are mine do not constitute policy of those I work for */
subnet aggregation script
Does anyone know of a tool/script that can aggregate subnets feed to it via command line? Meaning if I give it multiple /30s (or any size subnet) it will scrunch them together. Example: #aggregate_subnets.script 192.168.0.0/30 192.168.0.4/30 10.0.0.16/29 10.0.0.24/29 #192.168.0.0/29 10.0.0.16/28 Thanks. Ric Moseley VP of Engineering rmose...@softlayer.com 214-442-0555 direct 972-989-7813 cell 214-442-0600 office 866-398-7638 toll-free 214-442-0601 fax 6400 International Parkway, Suite 2000 Plano, TX 75093 http://www.softlayer.com The contents of this email message and any attachments are confidential and are intended solely for the addressee. The information may also be legally privileged. This transmission is sent in trust for the sole purpose of delivery to the intended recipient. If you have received this transmission in error; any use, reproduction or dissemination of this transmission is strictly prohibited. If you are not the intended recipient, please immediately notify the sender by reply email and delete this message and all associated attachments. image001.gif
Re: subnet aggregation script
netmask: netmask 192.168.0.0/30 192.168.0.4/30 10.0.0.16/29 10.0.0.16/29 192.168.0.0/29 Certainly available in the ubuntu repositories. On Mon, 21 Sep 2009 11:00:16 -0500 Ric Moseley rmose...@softlayer.com wrote: Does anyone know of a tool/script that can aggregate subnets feed to it via command line? Meaning if I give it multiple /30s (or any size subnet) it will scrunch them together. Example: #aggregate_subnets.script 192.168.0.0/30 192.168.0.4/30 10.0.0.16/29 10.0.0.24/29 #192.168.0.0/29 10.0.0.16/28 Thanks. Ric Moseley VP of Engineering rmose...@softlayer.com 214-442-0555 direct 972-989-7813 cell 214-442-0600 office 866-398-7638 toll-free 214-442-0601 fax 6400 International Parkway, Suite 2000 Plano, TX 75093 http://www.softlayer.com The contents of this email message and any attachments are confidential and are intended solely for the addressee. The information may also be legally privileged. This transmission is sent in trust for the sole purpose of delivery to the intended recipient. If you have received this transmission in error; any use, reproduction or dissemination of this transmission is strictly prohibited. If you are not the intended recipient, please immediately notify the sender by reply email and delete this message and all associated attachments. -- John
Google Pagerank and Class-C Addresses
Hello Nanog, I'm looking into a weird request which more and more customers have. They want different Class C addresses, by which they mean IPs in different /24 subnets. The apparent reason for this is that Google will rank links from different /24 higher then links from the same /24. So it's a SEO thingy. I googled a bit and found pages after pages of FUD and such great things as the Class C Checker: This free Class C Checker tool allows you to check if some sites are hosted on the same Class C IP Range. My question is: Is there any proof that Google does differentiate between /24s, or even better is there any proof that this isn't the case? I will not give a customer space from different address blocks just because he read it in a SEO magazine. Perhaps someone from Google itself can answer this question? Also how do you handle such requests? I expect I'm not the only one who gets them. Regards, Sebastian -- New GPG Key: 0x93A0B9CE (F4F6 B1A3 866B 26E9 450A 9D82 58A2 D94A 93A0 B9CE) Old GPG Key-ID: 0x76B79F20 (0x1B6034F476B79F20) 'Are you Death?' ... IT'S THE SCYTHE, ISN'T IT? PEOPLE ALWAYS NOTICE THE SCYTHE. -- Terry Pratchett, The Fifth Elephant
Cisco 7600 vs ASR 9000
I work for a small CLEC, we have been doing FTTP for 5 years now but are getting ready to update our core network and introduce IPTV services. Cisco has been recommending the Cisco 7600 as our core router. My concern is that cisco told us that in the event of an RSP failover the 7600 could take up to 30 seconds to begin routing packets again, this seems wrong to me since my old Extreme Networks BD 6808 can do failovers and rebuild route tables in under 5 seconds but?? More recently I have been reading up on the ASR 9000 however and it appears that it would be better sized for our company than the 7600. A few questions I have for the group. 1. Has anyone used the ASR 9000 in place of a Cisco 7600? 2. Is the ASR 9000 Carrier ready? Meaning 5x9's of availability, few component failures, solid software...etc 3. Has anyone had issues where it took the 7600 30 seconds to start routing again after an RSP failover? Thanks, Nick
Re: subnet aggregation script
On 2009-09-21, at 12:00, Ric Moseley wrote: Does anyone know of a tool/script that can aggregate subnets feed to it via command line? Meaning if I give it multiple /30s (or any size subnet) it will scrunch them together. I wrote this years ago and we used it in 6461 for various things. ftp://ftp.isc.org/isc/aggregate/aggregate-1.6.tar.gz Example: #aggregate_subnets.script 192.168.0.0/30 192.168.0.4/30 10.0.0.16/29 10.0.0.24/29 #192.168.0.0/29 10.0.0.16/28 [octopus:~]% cat input-file 192.168.0.0/30 192.168.0.4/30 10.0.0.16/29 10.0.0.24/29 [octopus:~]% [octopus:~]% aggregate input-file output-file aggregate: maximum prefix length permitted will be 32 [octopus:~]% cat output-file 10.0.0.16/28 192.168.0.0/29 [octopus:~]% It's quite bad at dealing with really long lists, but it's ok for small applications. There's a manual page, and options, and stuff. You can make it show its working, if you're worried about whether it is sane. [octopus:~]% aggregate -v input-file aggregate: maximum prefix length permitted will be 32 [0] + 10.0.0.16/28 [0] + 192.168.0.0/29 [1] - 192.168.0.0/30 [2] - 192.168.0.4/30 [octopus:~]% I forget exactly what the numbers in the brackets mean, but from memory 0 means it's a generated prefix and anything else refers to a line number in the input stream. No doubt the source would provide illumination. I don't remember why I thought it was a good idea to spit out the maximum prefix length warning to stderr every time. Joe
Re: NEW ON THE BLOCK
welcome to North America.. :) --bill On Mon, Sep 21, 2009 at 05:26:03PM -, Noah Adablah wrote: Hello, I am new on the block. Kind regards, Noah Adablah RF Systems Manager Africa Online Holdings Ltd Tel : +233-21-211823 Cell: + 233 246541404 Email: mailto:noah...@africaonline.com.gh noah...@africaonline.com.gh AIM: noahadablah cid:image001.jpg@01C8D62B.E2CE7C60 A Member of the Telkom South Africa Group Africa Online Disclaimer and Confidentiality Note does not apply to me or my posts. --bill
RE: Google Pagerank and Class-C Addresses
The apparent reason for this is that Google will rank links from different /24 higher then links from the same /24. So it's a SEO thingy. Just in case anyone cares, from personal experience, I can see that Google's priority is indeed 'rank by content'. Everything else is fluff. I've chosen a key phrase or two, and incorporated them multiple times into a blog entry. Looking at Google a couple of days later for those key words, and I can get a top three ranking quite easily. Ray -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
Re: Google Pagerank and Class-C Addresses
On Mon, Sep 21, 2009 at 11:12 AM, Ray Burkholder r...@oneunified.net wrote: Just in case anyone cares, from personal experience, I can see that Google's priority is indeed 'rank by content'. Everything else is fluff. This is not true. It's been well documented that PageRank uses a number of metrics, probably the most important of them (in terms of ranking) being the number of links to a page or site (and I believe, the PageRank of the pages/websites those links come from). One of my websites has consistently been in the top 10 or at worst top 20 results when searching for the word megapixel despite the word only appearing on the resulting page about 4 times - if it was simply content based there's no way that site would be ranked so highly. Scott.
Re: Google Pagerank and Class-C Addresses
Hey, I should tell my customers that the cross sum of the domains ip also count to the pagerank, and the ip 255.255.255.255 is the best of all. bye, ingo flaschberger
Re: Google Pagerank and Class-C Addresses
Sebastian Wiesinger wrote: Hello Nanog, I'm looking into a weird request which more and more customers have. They want different Class C addresses, by which they mean IPs in different /24 subnets. The apparent reason for this is that Google will rank links from different /24 higher then links from the same /24. So it's a SEO thingy. I've found that a lot of spammers enjoy having diverse ip's from which to mail/proxy requests. This may just be a case of ignorance/rumors on your customers part, but I might suspect some of them of being spammers... Leslie
Re: subnet aggregation script
Ric Moseley wrote:
Does anyone know of a tool/script that can aggregate subnets feed to it
via command line? Meaning if I give it multiple /30s (or any size
subnet) it will scrunch them together.
Here is a Perl script to do just that. My normal one reads from STDIN.
#!/usr/bin/perl
use Net::CIDR::Lite;
my $cidr = Net::CIDR::Lite-new ();
foreach (@ARGV) {
if (/^[0-9a-f\.:]+(\/\d+)?$/) {
$cidr-add_any ($_);
}
}
print (join (\n, $cidr-list ()));
Re: Google Pagerank and Class-C Addresses
On Mon, Sep 21, 2009, Jeffrey Lyon wrote: We used to have a lot of people buying IP's in bulk for SEO. They would all cancel within one or two months citing that they couldn't afford it or the project failed, etc. Guess they realized that the whole thing is a myth. .. or, which is more likely given my brief exposure to this crap, the search engines cottoned on and changed the metrics again. adrian
Re: Google Pagerank and Class-C Addresses
On Tue, Sep 22, 2009 at 1:56 AM, Jeffrey Lyon jeffrey.l...@blacklotus.net wrote: We used to have a lot of people buying IP's in bulk for SEO. They would all cancel within one or two months citing that they couldn't afford it or the project failed, etc. Guess they realized that the whole thing is a myth. Or they burned through all those IPs, google penalized domains on those IPs for obvious SEO gaming and they've now gone off to poison some other IP space --srs
