1,777 reputation
815
bio website perlmonkey.blogspot.com
location United Kingdom
age 39
visits member for 5 years, 6 months
seen Oct 7 at 14:14

I have been working as a Network Engineer and Systems Administrator in ISP/Telecommunications networks since 1996. I have extensive experience the BGP, OSPF, MPLS, IPv6, VoIP, ATM, DSL, QoS and many other TLAs.

I am married with a son and three dogs. I enjoy skateboarding, cycling, reading, music and pondering on the future of networking.


May
29
awarded  Yearling
Feb
21
revised What is the Maximum MTU supported in DSL Standards
added 152 characters in body
Feb
21
comment What is the Maximum MTU supported in DSL Standards
A mostly correct answer, but not to the question asked. I am a little wary about resurrecting this 4 year old question, as I am no longer involved in DSL service provision; however MTU and large scale misunderstanding of it is still a personal hobby horse of mine. You are correct to state that 4470 is often used as a default when running IP over AAL5 on ATM; however it is a convention not a standard. My question is whether the ITU standards define a maximum MTU for DSL, not what common conventions are used.
May
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awarded  Yearling
Dec
25
awarded  Nice Question
Jun
21
awarded  Enlightened
Jun
21
awarded  Nice Answer
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awarded  Yearling
Apr
3
awarded  Popular Question
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awarded  Notable Question
May
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awarded  Yearling
Apr
27
answered Is there a domain registrar that reliably provides ability to edit glue records?
Apr
26
comment How can I find out the next IPv6 address?
While I agree that trying to use stateless auto-config with less than a /64 is likely to cause a lot of pain, there is nothing in the RFCs that preclude the use of longer masks when manually configuring things. Auto-config is great for home / office client PCs; however in a hosted server or network infrastructure use of stateless auto-config is generally frowned upon and addresses will either be assigned manually or using a stateful config method (e.g. DHCPv6).
Nov
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awarded  Popular Question
Oct
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awarded  Enlightened
Sep
30
comment How can I find out the next IPv6 address?
Off by one error ;) 4294967296 (2^32) is the number of possible addresses in a /96; however the actual range is 0 - (2^32 - 1)
Sep
30
comment How can I find out the next IPv6 address?
As an aside - a /96 gives you as many addresses to play with as the entire IPv4 address space. You probably don't have to worry about efficient usage of the space - A VPS probably isn't going to need all of those addresses just for itself...
Sep
30
comment How can I find out the next IPv6 address?
Makes sense. Does the rest of my answer address your question?
Sep
30
answered How can I find out the next IPv6 address?
Jul
6
comment What is the Maximum MTU supported in DSL Standards
I'm not sure how much experience you have of dealing with incumbent telcos but my past experience tends to say that if you ask them this sort of question then you will be lucky to get any answer at all ;) To be honest I agree with you, the 1500 limit is likely to be entirely arbitrary choice made by the carrier. The main reason I asked the question though was to understand if there are any protocol limits or equipment limits rather than arbitrary design choices.