1,767 reputation
815
bio website perlmonkey.blogspot.com
location United Kingdom
age 39
visits member for 5 years, 3 months
seen Aug 20 at 13:44

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.


Jul
30
answered How to cut extension from pathname with basic unix tools
Jul
30
answered How to delete all hidden files and directories using Bash?
Jul
29
comment Making hosted applications resilient to BGP failures
Be wary of providers that will "cough up" a /24 or /23 of address space based on how much you are spending rather than demonstrable need. Chances are they are breaking the rules that they agreed to when becoming an LIR. Provision of Provider Independant address space is out of your service provider's hands. AFAIK no RIRs will make a PI assignment based on invoice size...
Jul
27
answered Slow internet bandwidth on Network
Jul
27
answered fiber to the desktop - which connector
Jul
24
comment What IP MTU sizes are seen in real networks
Previous comment should have read the IEEE have never standardised Jumbo frames. IETF have no remit to mess with the 802 standards...
Jul
24
comment What IP MTU sizes are seen in real networks
Jumbo frames of 9k are quite common in datacentres, especially if there are NAS devices present. Some ethernet vendors support jumbos of higher than 9k (largest I have seen supported is 15k) but 9k is the largest that is likely to be seen cross-vendor. Even the 9k figure varies from vendor to vendor (e.g. 9000, 9192, 9600). The sizes vary from vendor to vendor due to the fact that the IETF have never standardised Jumbo frames. The 802.3 standards all give 1500 as the largest supported payload.
Jul
20
revised Do entries in local 'hosts' files override both forward and reverse name lookups?
added 527 characters in body
Jul
20
comment Do entries in local 'hosts' files override both forward and reverse name lookups?
I haven't had a chance to look at the source yet; however a quick look at ldd output shows that on my system ping is linked directly to the libresolv DNS resolver library, which could imply that it is bypassing the nsswitch file and doing its reverse lookups directly...
Jul
20
answered Do entries in local 'hosts' files override both forward and reverse name lookups?
Jun
26
revised Are a RJ11 jack and a RJ45 socket physically compatible?
added 104 characters in body
Jun
26
answered Are a RJ11 jack and a RJ45 socket physically compatible?
Jun
26
revised What do you do when a command floods your terminal with too much output?
added 223 characters in body
Jun
26
answered What do you do when a command floods your terminal with too much output?
Jun
19
awarded  Nice Answer
Jun
19
comment How does autodiscovery work?
I have updated my answer with information on where I have seen supplimenting SNMP with CDP to be useful.
Jun
19
revised How does autodiscovery work?
added 658 characters in body
Jun
19
comment How does autodiscovery work?
I don't think I suggested that it could in my answer. My intention was to state that protocols such as CDP and LLDP can allow a discovery application to gather more information about network topology. I have used several network discovery tools which make use of CDP information when walking the network.
Jun
19
answered How does autodiscovery work?
Jun
18
answered Network Diagramming Software, FREE or Open-Source