(usr-tc) [SUMMARY] slow MLPPP on HiPerARC
After a little correspondence in private with a helpful and clueful 3Com employee (thank you), we've figured out the cause of the slow MLPPP we have been seeing with the HARC. It seems that the HARC does not fragment packets for MLPPP, it simply round-robins them out the interfaces. While this doesn't cause performance problems with sane protocols such as TCP, the software that our customer is using attempts to reinvent TCP over UDP. Badly. It sends one big packet, then waits for an ACK before sending the next one. The net result of this is that on a simple "ping" style test, a multilink bundle of any number of links won't show a significantly lower roundtrip time than a single link would. Also, I mentioned "mon ppp" showing traffic over only one interface on a multilink connection. This was confirmed as a "mon ppp" issue by 3Com. The "TAP USER" function shows traffic distributed across all interfaces. The "mon ppp" problem is slated to be fixed in upcoming releases, and there are plans to add a configurable parameter and/or RADIUS VSA to cause the HARC to fragment outgoing packets on multilink. As a temporary workaround until this code is available, we've found that lowering the link MTU for this particular customer alleviates the problem. It should be noted, however, that lowering MTUs may cause problems accessing certain sites that block all incoming ICMP. - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
Hello, I Need to upgrade my Radius software (NT). Does anybody have any comments on 3Coms 6+ version verses any other venders versions. I also use radius to authorize requests from Microsoft RRAS. Thank You, Jim Faulkner GWE.NET - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
We use vircom radius. Works with SQL or livingston text files. Also supports roaming and can limit duplicate logins. Package sells for 500-1000 (depends on options). As for the USR radius, it's been over a year since I used it (version 5.x). It stored passwrods in MS Access format. It was a good starter package. I'm sure they have made improvements since. Vircom info: http://www.vircom.com Jim Faulkner wrote:
Hello,
I Need to upgrade my Radius software (NT). Does anybody have any comments on 3Coms 6+ version verses any other venders versions. I also use radius to authorize requests from Microsoft RRAS.
Thank You, Jim Faulkner GWE.NET
- To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
-- Richard Lorbieski - richard@alpha1.net Chief Technical Officer - Senior System Administrator Alpha1 Internet http://www.alpha1.net 409.731.8236 - 877.4.alpha1 (877.425.7421) - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
Richard, When you upgraded from your USR 5 were you able to import your user data from the access database or did you have to reenter all of the user/password combos? Jim ----- Original Message ----- From: Richard Lorbieski <richard@alpha1.net> To: <usr-tc@lists.xmission.com> Sent: Tuesday, December 07, 1999 11:32 AM Subject: Re: (usr-tc) Radius Recomendations
We use vircom radius. Works with SQL or livingston text files. Also supports roaming and can limit duplicate logins. Package sells for 500-1000 (depends on options).
As for the USR radius, it's been over a year since I used it (version 5.x). It stored passwrods in MS Access format. It was a good starter package. I'm sure they have made improvements since.
Vircom info: http://www.vircom.com
Jim Faulkner wrote:
Hello,
I Need to upgrade my Radius software (NT). Does anybody have any
comments on
3Coms 6+ version verses any other venders versions. I also use radius to authorize requests from Microsoft RRAS.
Thank You, Jim Faulkner GWE.NET
- To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
--
Richard Lorbieski - richard@alpha1.net Chief Technical Officer - Senior System Administrator Alpha1 Internet http://www.alpha1.net 409.731.8236 - 877.4.alpha1 (877.425.7421)
- To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
- To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
No, the passwords were encrypted. Yet I didn't spend much time trying to unencrypted them. At the time, we had passwords written on the customer signup sheet and put the passwords in manually. Luckily, we had a small customer base. Today, I couldn't redo it manually :-)... Also, at that time we switched over from Quickbooks to a billing software called Rodopi. FYI, USR did have a util in their software that upgrade their database from 4.x to 5.x . I would assume they have one for 6.x . Jim Faulkner wrote:
Richard,
When you upgraded from your USR 5 were you able to import your user data from the access database or did you have to reenter all of the user/password combos?
Jim
----- Original Message ----- From: Richard Lorbieski <richard@alpha1.net> To: <usr-tc@lists.xmission.com> Sent: Tuesday, December 07, 1999 11:32 AM Subject: Re: (usr-tc) Radius Recomendations
We use vircom radius. Works with SQL or livingston text files. Also supports roaming and can limit duplicate logins. Package sells for 500-1000 (depends on options).
As for the USR radius, it's been over a year since I used it (version 5.x). It stored passwrods in MS Access format. It was a good starter package. I'm sure they have made improvements since.
Vircom info: http://www.vircom.com
Jim Faulkner wrote:
Hello,
I Need to upgrade my Radius software (NT). Does anybody have any
comments on
3Coms 6+ version verses any other venders versions. I also use radius to authorize requests from Microsoft RRAS.
Thank You, Jim Faulkner GWE.NET
- To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
--
Richard Lorbieski - richard@alpha1.net Chief Technical Officer - Senior System Administrator Alpha1 Internet http://www.alpha1.net 409.731.8236 - 877.4.alpha1 (877.425.7421)
- To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
- To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
-- Richard Lorbieski - richard@alpha1.net Chief Technical Officer - Senior System Administrator Alpha1 Internet http://www.alpha1.net 409.731.8236 - 877.4.alpha1 (877.425.7421) - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
On Tue, 7 Dec 1999, Richard Lorbieski wrote:
No, the passwords were encrypted. Yet I didn't spend much time trying to unencrypted them. At the time, we had passwords written on the customer signup sheet and put the passwords in manually.
Thanks to this list (I forget who told us), but we assimilated an acquired customer base from USR S&A on NT into our Cistron RADIUS server on FreeBSD. Just export the S&A user database to character delimited file. The "encrypted" passwords are very easy to unencrypt as there is simply a constant offset added to each character in the password (think ASCII value of each char). I don't know if the same offset value is used everywhere, but we found it to be the ASCII value for the CONTROL character (129? I don't have the ASCII table in front of me). --jeff ============================================================================ Jeffrey A. Lynch | JORSM Internet, Regional Internet Services email: jeff@jorsm.com | 7 Area Codes in Chicagoland and NW Indiana Voice: (219)322-2180 | 100Mbps+ Connectivity, 56K-DS3, V.90, ISDN Autoresponse: info@jorsm.com | Quality Service, Affordable Prices http://www.jorsm.com | Serving Gov, Biz, Indivds Since 1995 - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.
participants (4)
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Jeff Lynch -
jlf＠montrose-colo.com -
Richard Lorbieski -
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