536 reputation
1618
bio website
location Yokosuka, Japan
age 46
visits member for 4 years, 10 months
seen Apr 16 at 7:49

Englishman from Royal Leamington Spa who has lived continuously in Japan since 1988.


Apr
9
awarded  Popular Question
Jan
12
awarded  Nice Question
Dec
10
awarded  Notable Question
Oct
30
comment What determines the time to first ping response in an OS?
@joeqwerty in some managed services, the failure to respond to ping is escalated to the owner of the server. When a new VM is started up there will be a certain delay until Ping replies starts and these are logged as failures. Picky customers have asked "Why are we getting alerts?". I want to know exactly what services have to be up for Ping to be returned. e.g. Naïve administrators may assume erroneously that the network card will return pings as soon as it gets power, but that is obviously incorrect.
Oct
30
accepted What determines the time to first ping response in an OS?
Oct
30
comment What determines the time to first ping response in an OS?
Obviously it is not the firewall that responds to ping nor is it the network card. If I am not mistaken, the card just places the Ethernet frames in a buffer for the operating system's TCP Stack/Driver to inspect and respond to. The firewall hooks into the TPC Stack to modify it's behaviour. i.e. to filter certain packets and/or to allow the TPC Stack to return or not return ICMP ECHO requests. I think you will find that the network card doesn't come into this discussion at all..
Oct
25
asked What determines the time to first ping response in an OS?
Sep
29
awarded  Notable Question
Sep
9
revised What is the strategy for detecting time drift in a linux based data centre?
added 3 characters in body
Sep
2
asked What is the strategy for detecting time drift in a linux based data centre?
Jul
28
accepted Why would a heavily disk intensive application run faster on a SAN than on a Physical Disk?
Jul
24
awarded  Popular Question
May
22
comment I have two servers, how can I find the files that are different?
Hey, guys don't downv ote this solution just because it is commercial product. I didn't specify a free solution.
May
15
asked Limited SSH access for log retrieval
Sep
5
comment What kind of issues would occur if resolve.conf had no dns servers set?
I'm trying to gather the information about specific problems that will occur in order to make a case to someone that this is not a good idea. The answers which mention SSH reverse lookups failing are a good example which the customer would encounter when they first logged into their un-configured box.
Sep
5
accepted What kind of issues would occur if resolve.conf had no dns servers set?
Sep
5
comment What kind of issues would occur if resolve.conf had no dns servers set?
It's a hosted server somewhat like an Amazon instance.
Sep
5
comment What kind of issues would occur if resolve.conf had no dns servers set?
He uses windows. I'm asking specifically about Linux...
Sep
5
comment What kind of issues would occur if resolve.conf had no dns servers set?
I would like this to be a turnkey system too, but I am gathering information of about what issues would occur in order to present a case to the decision maker that this may not be a good idea
Sep
5
comment What kind of issues would occur if resolve.conf had no dns servers set?
I would like this to be a turnkey system too, but I am gathering information of about what issues would occur in order to present a case to the decision maker that this may not be a good idea