An Internet service provider (ISP) is an organization that provides access to the Internet.

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6
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2answers
12k views

postfix says mail sent ok, message does not arrive in ISPs inbox? no reject in log?

When I send a test message from my mail server to my @bellsouth.net email, The postfix log shows it was sent OK, but the message never arrives in my bellsouth inbox. Shouldn't I get a failure notice ...
2
votes
5answers
3k views

Downloads pause and time out frequently

I'm a new systems and network admin. My experience has been in the hardware and software of systems and servers, the network part is pretty new to me. I'm familiar with plugging numbers into network ...
0
votes
1answer
291 views

want to Request our ISp to do rdns/ ptr modify for my Staic IP ot point to my Domain?

we setup a mail server in our local office using Mdaemon Mail Server . We have a Staic ip 123.xxx.123.xxx ( as an example ) and all necessary ports (80 , 25 , 110 ) are made open . We have a ...
0
votes
1answer
263 views

Cache Appliance for ISP [closed]

We want to invest in a Cache Appliance solution to reduce our bandwidth and improve the user experience. Which cache appliance do you recommend? So far I have these candidates CacheBOX and CacheMara. ...
2
votes
2answers
368 views

What sort of magic is my ISP doing? [closed]

While trying to setup OpenDNS, and failing to make website filtering actually work, I realized my ISP is doing something nefarious with all HTTP requests. To make a long story short, if there's a ...
-1
votes
2answers
91 views

Is this server setup efficent? [closed]

I have a web server at home. My IP address changes very often. My domain registrar is GoDaddy, so DynDNS does not work because GoDaddy only allows IP addresses for the A DNS Record. I can set a CNAME ...
-2
votes
2answers
178 views

My bulk email company supresses all hard bounces -even if they get their IP's blocked

I send out about 500,000 emails every week. I have been sending the list out for about 1 year. But in conversation, I was advised that the company sends in a shared IP manner. So my list goes out ...
7
votes
4answers
377 views

Why are ISP's installing routers on my site when the feed is a form of ethernet already?

I'm connected to 3 ISP's right now. Two of them already have routers at my site, the third one announced me "they need to install some equipment" when I requested BGP session. I can only assume they ...
0
votes
4answers
2k views

Find the ip address of my modem from outside my network [closed]

I am out of town, and dyndns droped my account and deleted my ip address. I set up a new dyndns account, but I really need the ip address of my home modem. Is there any way for me to retrieve it? ...
0
votes
2answers
672 views

E-mail PTR failure - Spamcannibal

My IP is on Spamcannibal list. So I can't communicate with my registered partners. To be precise I can't send e-mail to only two domain. Everything else is ok. I try to talk with my domain/server ...
1
vote
2answers
1k views

Where to find/buy full list of updated ISP IP ranges?

I need to assign IPs of a huge daily visitor IPs to the ISP they come from. So I thought of buying the list of IP addresses corresponding to ISPs. Now so far I have only found: ip2country But I am ...
1
vote
1answer
58 views

What is typically involved on the ISP's behalf when you increase bandwidth on a leased line

We have a leased line with Virgin Media. It's a 100Mbit/s circuit but we're only currently paying/using for 10Mbit/s. We want to increase the speed and have been quoted a 10 working day turnaround ...
-2
votes
1answer
338 views

ISP blocked routers: chap authentication failed [closed]

Some greedy ISP blocked our routers in vise versa country, routers worked fine about 2 years. First type of blocking was by ttl, and second type now. Waking up in the morning I found a line in the log ...
1
vote
1answer
86 views

When to expand a web server's unshared connection?

We have a 3 mbps by 3 mbps dedicated, unshared pipe that hosts a web server, mail server, and VoIP/web browsing traffic for 8 employees. The web server hosts a few different sites that average about ...
12
votes
1answer
4k views

How does DNS nameserver fall back work?

We have two DNS servers listed in our NS record. Last night, one of our DNS servers went down. As expected, some DNS servers were not resolving our hostnames. I assumed this would be temporary and ...
1
vote
2answers
128 views

Cisco ASA adding ISP static IP

We're about to switch from our old ISP to a new one. How do I assign static ISP-assigned IP CISCO ASA interface? Should I define it under NAT or Access Rules? Is it easier through console?
1
vote
1answer
914 views

Dual ISPs - Load balancing

We currently have 1 ISP and are adding a second. I need to load balance this into our current network so it shares the bandwidth between our 2 ISPs. We have a total of about 10 external IP addresses ...
0
votes
3answers
257 views

How do ISP's block ports? [closed]

I'm currently working on a small town in Argentina and the only ISP that gets here is called Arnet. The connection stability sucks, the help desk is anything but helpful (non techs hired for around 2 ...
0
votes
2answers
2k views

IPsec tunnel keep crashing

I have 2 locations. On each location is installed VPN device Cisco RV042. Link between location is optical fiber. ISP is the same. Link speed on location A is symetric 3/3 Mbps, and there is static ...
1
vote
1answer
91 views

How to diagnose whether a customer's ISP is throttling access to my website?

We host a website that servers up mostly static files, such as html and flash SWF files. The server is hosted in Auckland, New Zealand. Our customers are mainly secondary/high-schools. In general, ...
2
votes
2answers
1k views

How do ISPs calculate bandwidth? [closed]

I mean, is 100 GB per month 100 * 1000^3 bytes or 100 * 1024^3 bytes? Wondering if they use the decimal definition like HDD manufacturers or the binary definition. I do know that there's technically ...
-3
votes
1answer
456 views

Which port of my computer is my ISP connected to? [closed]

I'm trying to find out the port number of my computer to which my ISP actually connects & provides the internet service, given my ADSL modem is operating in Bridge Mode instead of PPPoE. I ...
12
votes
2answers
1k views

Linux TC class/filter numbering

I'm currently working on a traffic shaping solution for ISP-level companies, and came to an interesting (kindof philosophical) problem. Looking about the number of endpoints the system should handle ...
-7
votes
3answers
678 views

Add frame window to all websites for users on network

I'm working for a small ISP and I'm trying to figure out how I can add a frame window to all websites that all users on our network see, so that we can promote faster speeds / notify users of ...
0
votes
5answers
135 views

Discrepancy between IPs in DNS and actual location address

I have inherited an environment where many things don't make sense and I am now in charge of making changes to it and for this I have to understand what the hell is going on before I modify. Long ...
0
votes
1answer
246 views

ubuntu-server 2 network devices, 2 isp

Hello I have the following szenario: I have 2 ISPs behind seperate routers, and one web/ssh-server with 2 ethernet cards. I want the webserver to be reachable from both isp. I have forwarderd each ...
-1
votes
2answers
2k views

I cannot access some sites from my ISP sometimes [closed]

This happens a lot to my own sites that i browse daily from my ISP internet. Most of them are wordpress site. I host in webhosting provided by hostforweb. First it opens well and i can login to admin ...
2
votes
1answer
78 views

Questions and opinions of a Cable line with a back-up T1

My company currently has only a Covad T1 that connects the main office to the internet. This line is mainly for our billing office (located across the state) to connect to us for our Terminal Server. ...
2
votes
6answers
7k views

Intermittent high ping/latency problem

I have been working with my ISP (which is a WISP, actually Fixed Broadband Wireless) trying to figure out why I intermittently get high latency. The latency is detectable in online games and other ...
0
votes
1answer
121 views

File download speed issue over a dedicated fibre link

My ISP has installed a fibre based dedicated internet connection at the place where I work. In the beginning the connection terminated at one of the ISP's core routers. It resulted in a strange issue. ...
1
vote
4answers
2k views

How to set up daisy-chained routers for separate sub-nets?

This question seems to be similar to others, but I'll take a shot anyway. A client recently switched ISPs from TDS to Comcast Business Class. Before the switch, they had 5 static IP addresses ...
1
vote
3answers
413 views

Hosting web server via FTTH (Fibre To The Home) or datacenter

I'm a .Net programmer that currently using web hosting provider to host my web applications. In my place, currently there is offer of 20 Mbps FTTH (Fibre To The Home) internet line by an ISP. This ...
0
votes
2answers
66 views

Question about domain name server

I have set up a DNS server in my home, will I have to wait for the isp to refresh there cache before DNS is active? Some website I have found says this is called "DNS propagation time" and how long ...
2
votes
3answers
181 views

How to tell if a router traffic shapes?

I have a client in a managed office, and part of that service is the provision of internet, with static IPs for all desktops provided by the building, (I know it's a recipe to have all your data ...
1
vote
4answers
184 views

Hardware Solution to connect to multiple ISPs for one WAN

I'm looking for a piece of hardware to connect to different types of ISPs, normal DSL, cable DSL and USB egde sturfstick to offer one Internet connection with a higher cumulated bandwidth. I'm pretty ...
2
votes
2answers
710 views

How do an ISP's DNS servers resolve a local hostname?

This might be a stupid easy question for some of you, but I couldn't find a fast, accurate answer online. I had a problem recently where I was trying to SSH to a local FreeBSD server, but the ...
2
votes
1answer
3k views

ISP Point of Presence versus ISP data center and what effect it has on CDN server deployment

I would like to clarify my understanding of the difference between an ISP Point of Presence and an ISP data center. Perhaps more importantly, I'm trying to understand at what kind of granularity each ...
3
votes
5answers
754 views

QoS configuration for a medium ISP

What is the best Linux-based QoS platform to implement a configuration where all 256Kbps DSL clients (all belong to the same IP range) get a guaranteed speed of 200Kbps with single QoS rule?
7
votes
2answers
981 views

ISP grade Proxy

We are a ISP in Africa (bandwidth is expensive, more than 800 USD per Mbit). Instead of investing in more bandwidth I believe it can be worthy to invest on web proxy appliance. I prefer to use mature ...
1
vote
3answers
320 views

ISP like Linux WAN router/gateway

My ISP has installed a fiber link at the place where I work. It has provided an ethernet WAN link to my office and has given a set of static ip's on 187.xxx.xxx.224/29 network. I need to setup a linux ...
1
vote
5answers
412 views

How do I notify everyone in a network that the Internet connection is down?

Our internet connection is awful. It goes up and down several times during the day without warning. Every time it does, we get a large number of calls saying the network is down. Replacing the ...
0
votes
4answers
95 views

Reasonable assumption about an ISP's IP range

I have made a visitor tracking script for my demo server. I want to add a rule so that my own page hits are not recorded. But the problem is, I don't have a static IP. I have a DSL connection with ...
0
votes
1answer
2k views

Disable (ISP) Caching - WAMP

I have a server that I use to send emails. The emails have an image, that is used to track their being opened, that is in the form of <img ...
0
votes
1answer
193 views

how does an isp provide public ip to the client [closed]

how does the isp provide public ip from where did they get the public ip registerd
2
votes
1answer
2k views

2 ISPs into ASA 5510 (base license) and separate traffic by protocol (port). Is it Possible?

I've been tasked with setting up our ASA to allow traffic from two ISPs. Currently, ISP1 is for mail, VPN, Remote Web Workplace (SBS 2003), and internet. My boss would like me to set up the DMZ ...
3
votes
4answers
119 views

Only able to use the first IP in a range from ISP

Right now I have a subnet of 16 IPs. I want all of the ips to be "owned " by my firewall. I have a watchguard firewall statically configured with X.X.X.225 and has X.X.X.226 - 238 as Secondary IPs. ...
-1
votes
2answers
254 views

What ISP do hosting providers use?

I'm wondering how large internet businesses or hosting providers deal with ISPs. Thanks.
2
votes
3answers
567 views

Google DNS Geolocation Issue

I work on a ISP in Africa. Our customers were being redirected to Google cache in South Africa. Apparently with no reason, they start being redirected to Google US, which for us has higher latencies ...
1
vote
2answers
177 views

Is it possible to use 2 lines from 2 diffrerent ISP?

How can I (if it is possible) to set up the network gateway if I have 2 internet lines from 2 different ISPs? Furthermore, one of them is forwarding /28 static ip for (into) our network. Is there a ...
3
votes
3answers
149 views

Number of routers in small community lock up and require reboot

I live in a small town which has one primary ISP. Lately I have noticed that a number of wireless routers have been locking up and requiring a reboot before allowing any connections. This has affected ...