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Re: FEC (Fast Etherchannel) issues
by Kevin Brown 20 Mar '99

20 Mar '99

Although I am by no means the authority on how FEC works, I do understand the technology at issue. Cisco's implementation of FEC uses the X-OR (exclusive-OR) algorythm, and examines the last two bits of the source and destination MAC addresses. In doing this, there will be one of four possible results ( 01, 00, 11, 10 ). Each of these possible results are mapped to a bundled link. In your case, since you say you are doing this between routers, and your requirement seems to be load balancing between links, then I would suggest using a layer 3 routing protocol like OSPF that will automatically load balance between links with the same administrative cost. Again, I don't consider myself the man with all the answers, but if you are doing this between routers, then I would most definately keep my load balancing in the L3 arena, especially when it could be from a standards-based routing protocol rather than a quasi-proprietary protocol. My 2 cents, Kevin Brown Sr. Data Systems Engineer Sprint - BMO - JCMO ## nothing I say is to be considered the position of my employer. so there! ##

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RE: ADSUs on DS1 lines
by Chad Skidmore 19 Mar '99

19 Mar '99

Take a look at the Cisco 3810. Regards, Chad -----Original Message----- From: Charles Sprickman [mailto:spork@inch.com] Sent: Friday, March 19, 1999 12:47 PM To: nanog(a)merit.edu Subject: ADSUs on DS1 lines Hi, I hope this is on-topic enough (it was in the past)... Looking at the archives of this list, there was a brief thread about ADSU/HSSI vs. the AIP card. Most people came out in favor of the AIP card, citing such things as brokenness of the ADSU's implementation of traffic shaping. So the AIP seems the way to go. My question then is what can you do when you need to connect to an ATM cloud via DS1? So far I've only seen Kentrox and Fore products that fit the bill. Anyone using these? Are you happy with them? Are they 'broken' in any fundamental way? Any routers available that take a DS1 ATM line directly? Thanks, Charles -- =-----------------= = | Charles Sprickman Internet Channel | | INCH System Administration Team (212)243-5200 | | spork(a)inch.com access(a)inch.com | = =----------------=

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ADSUs on DS1 lines
by Charles Sprickman 19 Mar '99

19 Mar '99

Hi, I hope this is on-topic enough (it was in the past)... Looking at the archives of this list, there was a brief thread about ADSU/HSSI vs. the AIP card. Most people came out in favor of the AIP card, citing such things as brokenness of the ADSU's implementation of traffic shaping. So the AIP seems the way to go. My question then is what can you do when you need to connect to an ATM cloud via DS1? So far I've only seen Kentrox and Fore products that fit the bill. Anyone using these? Are you happy with them? Are they 'broken' in any fundamental way? Any routers available that take a DS1 ATM line directly? Thanks, Charles -- =-----------------= = | Charles Sprickman Internet Channel | | INCH System Administration Team (212)243-5200 | | spork(a)inch.com access(a)inch.com | = =----------------=

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Re: DNS entry abuse question
by Sanjay Dani 19 Mar '99

19 Mar '99

You can partly address this by affecting some of the services. You can configure your HTTP/1.1 server to blackhole queries for molvis.org. The telnet/ftp services do not give such flexibility (of configuring per "name" that maps to the IP address the service responds to). >We recently discovered that bee.net DNS is pointing the name molvis.org at >our main web server, www.emory.edu, without our permission. The billing >contact for molvis.org is a student at Emory. > >Although we can contact bee.net and the student to address this violation >of our policy, my question is whether there is anything we can do in >general to prevent people from pointing DNS names at computers at Emory >without our permission. Presumably there is great opportunity for mischief >here, in that someone could register a domain name such as emorysucks.org >and point it at our web site. > >If this is the wrong place to ask this question, please accept my apology >and suggest an alternate place. > >Thanks for any advice you can give. > >Peter Day >Emory.edu administrative contact >Information Technology Division >N. Decatur Bldg Suite 300 | E-mail: ospwd(a)emory.edu >Emory University | PHONE: +1 404 727-7678 >Atlanta, GA 30322 | FAX: +1 404 727-0817

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The Cidr Report
by Tony Bates 19 Mar '99

19 Mar '99

This is an auto-generated mail on Fri Mar 19 12:00:00 PST 1999 It is not checked before it leaves my workstation. However, hopefully you will find this report interesting and will take the time to look through this to see if you can improve the amount of aggregation you perform. The report is split into sections: 0) General Status List the route table history for the last week, list any possibly bogus routes seen and give some status on ASes. 1) Gains by aggregating at the origin AS level This lists the "Top 30" players who if they decided to aggregate their announced classful prefixes at the origin AS level could make a significant difference in the reduction of the current size of the Internet routing table. This calculation does not take into account the inclusion of holes when forming an aggregate so it is possible even larger reduction should be possible. 2) Weekly Delta A summary of the last weeks changes in terms of withdrawn and added routes. Please note that this is only a snapshot but does give some indication of ASes participating in CIDR. Clearly, it is generally a good thing to see a large amont of withdrawls. 3) Interesting aggregates Interesting here means not an aggregate made as a set of classful routes. Thanks to xara.net for giving me access to their routing tables once a day. Please send any comments about this report directly to me. Check http://www.employees.org/~tbates/cidr-report.html for a daily update of this report. ------------------------------------------------------------------------------ CIDR REPORT for 19Mar99 0) General Status Table History ------------- Date Prefixes 120399 56938 130399 57039 140399 56857 150399 56894 160399 57203 170399 57348 180399 57351 190399 57539 Check http://www.employees.org/~tbates/cidr.plot.html for a plot of the table history. Possible Bogus Routes --------------------- *** Bogus 123.217.230.0/24 from AS174 AS Summary ---------- Number of ASes in routing system: 4691 Number of ASes announcing only one prefix: 2322 (1249 cidr, 1073 classful) Largest number of cidr routes: 383 announced by AS701 Largest number of classful routes: 851 announced by AS701 1) Gains by aggregating at the origin AS level --- 19Mar99 --- ASnum NetsNow NetsCIDR NetGain % Gain Description AS271 356 145 211 59.3% BCnet Backbone AS2493 265 148 117 44.2% iSTAR Internet, Inc. AS174 641 528 113 17.6% Performance Systems International AS11305 116 8 108 93.1% UNKNOWN AS226 204 99 105 51.5% USC/Information Sciences Institut AS4755 159 82 77 48.4% Videsh Sanchar Nigam Ltd. India AS3749 138 62 76 55.1% TECNET AS4293 209 138 71 34.0% IMCI AS1267 94 24 70 74.5% IUNET-AS AS4200 165 97 68 41.2% AGIS (Apex Global Information Ser AS7046 273 208 65 23.8% UUNET-CUSTOMER AS7545 110 46 64 58.2% TPG Internet Pty Ltd AS7496 96 34 62 64.6% Power Up AS1221 430 368 62 14.4% AARNET-AS AS1239 523 466 57 10.9% SprintLink Backbone AS4740 364 311 53 14.6% Ozemail Pty Ltd (ASN-OZEMAIL) AS7657 159 107 52 32.7% The Internet Group Limited AS72 91 39 52 57.1% Schlumberger Information Network AS3493 229 178 51 22.3% INTERLINK AS577 223 173 50 22.4% Bell Canada Backbone AS10928 100 51 49 49.0% UNKNOWN AS719 457 409 48 10.5% LANLINK autonomous system AS5674 80 36 44 55.0% PBI-NET-BLK AS852 174 135 39 22.4% AGT Advance Communication AS803 73 37 36 49.3% SaskNet Backbone AS7745 39 4 35 89.7% BIGSKY-AS AS7122 111 78 33 29.7% MTS ADVANCED Network Policy AS6332 92 59 33 35.9% TELNOR AS1 506 473 33 6.5% BBNPLANET AS1785 248 216 32 12.9% NYSERNet Backbone For the rest of the previous weeks gain information please see http://www.employees.org:80/~tbates/cidr-report.html 2) Weekly Delta Please see http://www.employees.org:80/~tbates/cidr-report.html for this part of the report 3) Interesting aggregates Please see http://www.employees.org:80/~tbates/cidr-report.html for this part of the report

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Re: DNS entry abuse question
by Randy Bush 19 Mar '99

19 Mar '99

> its not a lame delegation, someone is pointing an A record at their web > server. <doh> sorry. ietf wipeout. randy

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re: dup packets
by cache22 19 Mar '99

19 Mar '99

gridnet *is* suffering a serious problem with packet duplication at many of their peering points. in some cases the duplication happens in both directions causing tcp breakdowns and frequent rst's. it has been escalated but hasn't been fixed in two days so i suspect it will require a lot of router reloading. matt sommer sysadmin webkorner.com

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Question about subnetting /24's
by Scott Gifford 19 Mar '99

19 Mar '99

OK, so this is probably somewhat of a stupid question. But I thought I knew this stuff, and so did the tech support guy I almost ended up in a screaming match with. :) Can anybody let me know if I'm missing something I should know by now? I have a /24 network I want to subnet into two /25's. For realism's sake, let's call the network 216.40.155.0/24 (mask 255.255.255.0) So I have two 126-host networks, namely 216.40.155.0/25 (mask 255.255.255.128) 216.40.155.128/25 (mask 255.255.255.128) The person with whom I was calmly discussing the matter said that this configuration didn't make any sense, because my first subnet had all zeroes in the last octet, so it was an all-zeroes subnet; and the second had all ones on the last octet, so it was an all-ones subnet. And that these subnets were reserved as the network subnet, and the broadcast subnet, much as all-zeroes and all-ones in the host portion indicate the network and broadcast addresses. I would have dismissed this out of hand, but our router wouldn't let us use this first network unless I enabled the "zero subnet enable" option. And with the second, the customer had to say it was an all-ones subnet or some such thing. This seemed to imply that maybe I was doing something weird. Both myself and the customer are using Bay Networks routers. Can anybody shed any light on this? Is this just something I've competely missed in everything I've learned about IP? Are my routers crazy? Is the tech support guy crazy? Is it just that I've finally gone crazy?... Oh, and while I'm on the subject, is there a cleaner way to delegate IN-ADDR.ARPA for subnets of a /24 than 128 seperate delegations, one for each individual IP address we've assigned? If anybody else is interested in this, let me know, and I'll summarize direct responses to the list. Thanks for any insight, suggestions, ideas, or referrals to a good psychiatrist in the Greater Flint area, ------Scott.

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SUMMARY: Question about subnetting /24's
by Scott Gifford 19 Mar '99

19 Mar '99

I got several requests emailed to me personally from other network operators who also wanted this information, so I'm posting a summary back to the list. If you feel this information is beneath you, by all means stop reading right now! :) Basically, the reason why I had to go out of my way to enable the subnet where the network portion of the last octet was all-zeroes or all-ones is a relic from Ancient Times (read: about 18 months ago), when classful networking was everywhere, and RIPv1 walked its hallowed halls. RIPv1 does not send subnet information in its route announcements, so the subnet that contained the Class C network and broadcast address were off-limits. While many routers come this way by default (a situation which one respondant described as "abominable"), everyone seemed to be in agreement that any router that did not totally suck would let me turn this off. A few others added to this that they felt my Bay Networks router *did* totally suck. As proof that this isn't the case (at least not this time), the problem ended up being completely unrelated to the subnetting. But I was still curious. On a Cisco, the command is "ip subnet-zero" and "ip classless". On a Bay, the "Enable zero subnet" button in Site Manager does the trick. As backup ammo against future tech support incidents, several people pointed out RFC 1878 and 1519, which lays all this out. With regards to reverse DNS, several people pointed me to the advice in RFC 2137. It's just a few pages, and sums up the situation better than I could. Thanks to the numerous people who responded by private email, -------Scott.

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Re: Question about subnetting /24's
by Brett_Watson＠enron.net 19 Mar '99

19 Mar '99

welcome to nanog, scott. while your question actually contained more technical, networking related material than most anything posted here, you'll get blasted for it none the less. see, most people here just magically aquired all this useful information and never had to ask anyone for help. now if you'd asked about the weather, or posted a note about how much you hate spam, or better yet why spam is ok, that seems to be relevant to nanog, or maybe michael dillon's physical build, or his karate belts, or... well you get the point. it's safe to post to nanog once you've read the charter, lurked for 12 months, absorbed each individual's variation of what's ok to post and what's not.... actually, forget it, buy a book. -brett

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