Feasability of connection failure to single IP address when others function

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Ninefish

35 posts

Geek

#32586 20-Apr-2009 13:27

I've been experiencing some issues connecting to imap.gmail.com 993 using Vodafone for my ISP. Red network isn't involved, these are wholesale lines

real question is this:
What I'd like to understand is how a single IP addresses could be so affected by either my home router or by the [ISPs] systems when neither one has pinholes/port forwarding invoked

I'm guessing it can't, or it can [not maybe] I'd like to know how it could happen if it can be done. This would allow me to understand where the 'blocking' could have happened and how...

issue:
consistent failure to connect [timeout]
various OSs involved
various email software
at one time, I couldn't access www.vodafone.co.nz whilst all other sites visited worked normally

there were no port forwards on either of the routers I tested/use
there were no 'non standard' settings other than to change default router IP to 192.168.1.99
there was only a change to the admin password no other settings

dan

1134 posts

Uber Geek

Lifetime subscriber

#208174 20-Apr-2009 15:16

unlikely, unless google has blocked your ip, which is also unlikely

based on your 2 other threads about this and other internet issues, i havent seen any as pings/tracerts/telnets to the google servers to clarify, its likely the issue is on your LAN side.

these kind of problems, its hardly ever the ISP, often the simplest solution maybe correct, basics such as
DNS Issues /Router firewall/Software Firewall/Virus Scanner/ Packet Loss / Spyware / Buggy DSL Router / the list goes on really.

if you are really desperate, send me a PM and you can allow me to temporily dial in and i'll give you my opinion.

Ninefish

35 posts

Geek

#208185 20-Apr-2009 16:31

dan:
these kind of problems, its hardly ever the ISP, often the simplest solution maybe correct, basics such as
DNS Issues /Router firewall/Software Firewall/Virus Scanner/ Packet Loss / Spyware / Buggy DSL Router / the list goes on really.

DNS, isn't that mostly outside my LAN [other than using the iHug DNS servers in our settings

The software firewall hasn't changed before or after the issue appeared/disapeared [we're not running software firewalls [other than within the OS, and most machines within the LAN are not running OSX provided firewall]

There's no virus software on the Macs, and none running on the router, PCs are running free virus software, everyone was affected by the failing IP addresses

Packet Loss was found,but not consistently
telnet to the server was functional some of the time, but because it was secure, I couldn't [easily] check anything past the secure doorway. Of course, the time out happened behind the security of the imap server.

I understand that a Macintosh isn't necessarily immune to virii and spyware but I am fairly certain it's not that

I used two routers, both had the issue, I bought the second one just to test the issue.

I understand the issues are 'hardly ever the ISP' but I'm still wondering about how the mechanics of this issue can come about.

How can my LAN block or sufficiently delay one IP address and port?

How can one IP address and port be blocked or sufficiently delayed by my ISP?

insane

3240 posts

Uber Geek

ID Verified

Trusted

#208460 21-Apr-2009 23:15

How can one IP address and port be blocked or sufficiently delayed by my ISP?

Well I assume you're talking WAN address and not yout local LAN IPs , and in that case if one were in a different range to the other then ISP routing could well be a possible cause.

See if you can get a tracert from google back to your IP, (google for 'looking glass') as sometimes the traffic comes back via a different path than it was sent.