Questions tagged [isp]

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

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Load balancing ISPs without double NAT

I configures my TP-Links ER605 multi-wans router to load balance between my two ISPs (that is working). But since my Web/NAS server is behind my router on the 192.168.2.0 network, any computers on ...
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Website will not load for certain ISPs

My website will not load correctly for certain ISPs. I have verified with both the DNS provider and the website host that all information is 100% correct. However, certain internet providers yield ...
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Is rejecting email based on IP address in chain allowed?

A major ISP is rejecting email (bouncing with error 550) on the basis that an IP address in the transmission chain is on their 'blocklist'. Are they allowed to do this and still be IETF compliant? ...
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Do DNS queries reveal full URLs? [closed]

I use my ISP's DNS, which means that if I access "example.com" they will know, but will they know the exact page? (eg. "example.com/something.html"). As far as I know, if I access &...
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How to find out DNS Server IP of other ISPs

I am currently building a tool that needs the response from multiple different DNS Servers. The programming part is all done but I am currently lacking the IP Addresses of major ISP DNS Servers. All I ...
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TCP DUP ACK/Out-of-Order/Previous segment not captured/Retransmission flooded on wireshark logs

Due to slow network, I installed wireshark on the device(laptop) to find this This is a log of the device using internet(Downloading a file),as you can see at the right end of the screenshot, the ...
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-1 votes
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Router doesn't have a public ip adress

I have a problem with my ISP where my router gets a different ip adress compared to my external ip adress (the router doesn't have a public ip adress). I previously setup a VPN service with EdgeMax ...
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Stretch ISP links to virtual NGAF appliance hosted within HCI Cluster

Our existing network has two ISP links, connected to CISCO ISR4351 router ISP1: (total 6 usable Live IPs) IP: 192.168.201.212 Subnet: 255.255.255.248 Gateway: 192.168.201.209 ISP2: IP: 172.20.28.236 ...
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What is this private LAN address accessible through my ISP?

Recently some websites I regularly visit (most recently docker.com, atlasobscura.com; both of these sites return an issue with a fortinet-ca2 certificate) have started showing certificate issues on my ...
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-2 votes
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How medium-sized servers are connected to the internet?

I'm curious about how the servers are connected to the internet. Suppose I develop a web application that requires multiple machines to provide services. For example, I want to host the frontend on a ...
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Unable to route ports, ISP assigned private address - connection down issues every 4 hours

I have a big problem, I live in an area where there is no fiber or ADSL connection and I connect to the internet using a 4g+ sim in a 4g+ router (Tp-Link Archer MR600). The connection is just fine: ...
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2 answers
512 views

Unknown private IP addresses tried to log in to my router's admin panel

I noticed some weird traffic in my router's admin panel logs: 2021-03-25 06:27:19 [Critical][Config-Log] Terminal:WEB(10.181.189.71),Result:Fail,Type:Login,Username:- 2021-03-25 06:27:22 [Critical][...
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-2 votes
1 answer
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how to configure static lan ip to different router provided by isp?

We have got Vodafone Internet ISP. We asked for 5 public ip's. They had provided 1 wan ip and 5 lan ip pool. WAN Configured and internet working but LAN ip how to use, i need 5 static ip address to ...
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64 votes
7 answers
9k views

Government censors HTTPS traffic to our website. Workarounds?

I am helping run a website that has been blocked for political reasons by the same Russian agency that has previously tried blocking Telegram (RosKomNadzor). This is not the first time it happens, and ...
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Domain blocked by ISP

ISPs blocked my domain in one country. It redirects to an IP address that the ISP uses to block access to sites it blocks. (https://ispipaddress:8080/mydomain.com) The URL cannot be accessed directly, ...
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OpenWrt allow IPv6 rule to access a server with global IPv6 on local area

First of all, I have a domain with dns configured to point to my device global address witch is set to static with my ISP gloabl prefix as xxxx:xxxx:xxxx:de01::3/64 in dhcpcd.conf. I'm using Openwrt ...
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Which tool ISPs use for browsing logs?

It is known that ISP has to log various network data for various purposes, such as law enforcement needs. However, what are some examples of software tools used by ISPs to browse this huge amount of ...
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How to check if my server's IP has somehow been blocked by some ISP?

I have an app, published on Play Store and App Store, that works via API with our webservices. Nothing fancy, really really basic stuff. Now, some customers can't use the app because it can't reach ...
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PTR recored Issue

We have 2 Mail servers ( Internal and External) the External is hosted by ISPA with ip address of 62.xxx.xxx.xxx, we use to have the internet from the same ISPA, and the PTR record is already setup. ...
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4 votes
2 answers
720 views

My static ips are inaccessible only from CenturyLink users across all ports

The Problem: How do you diagnose an ISP specific connectivity problem? I host a few sites on local machine. I pay for a business class account with Centurylink and have a lot of 5 static ips. The ...
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2 answers
160 views

Does an IPSEC tunnel establish new sessions for traffic?

Background AT&T business fiber is basically rebranded U-Verse home internet. The "modem" (it's actually a router, but lets call it that for simplicity) has a hard limit of about 8K ...
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Losing connection to servers after 5 min (different ports)

A month ago I moved and made a new contract with a new ISP (Claro Peru). Since I switched from ISP I noticed that my connections to servers are always cut after 5 minutes of inactivity (Connections to ...
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1 answer
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dual ISP firewall cluster in linux

For the past couple of weeks i have been trying to figure out how to make firewall cluster, each having different ISP. I have found few guides on how to do it with one ISP using technologies like ...
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| rDNS | IP gets resolved with a wrong hostname

I've been trying to set up rDNS so my IP could get resolved to my hostname in a program which has a built in rDNS lookup feature. I had done everything I was suggested (ask my ISP to make a PTR record ...
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Preventing Script Injection from ISP (Proxy Analyzer) through VPN

I'm using Sophos SSL VPN Client. But I'm using BSNL ISP. Whenever I connect my VPN and browse any HTTP non-secured websites ADS gets injected into the JS script file. But when I disconnect a VPN and ...
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How to make old router as access point? [closed]

I have installed a new router at my home, the new router has 4 ports. And the ISP only allowed for one port to have internet connection using ethernet. That port is taken by another person, and now ...
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1 answer
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i want to visualize myself about bandwidth of internet [closed]

as we know bandwidth is just a way through which data flows.20 Mbps internet means 20 mega bits per second and 40 Mbps means 40 mega bits per second.i guess 20 Mbps means 20 Mb of data is retrieved in ...
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1 answer
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Gateway failover

I have an Ubuntu server acting as a gateway for inbound internet connections. This server shut down unexpectedly because of overheating and lost all internet connections during business hours. How can ...
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1 answer
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Can my ISP detect what YouTube stream quality i play on my device [closed]

I would like to know if there is a way that my ISP can detect the youtube stream quality I use on my device. For Example- When I watch youtube video in 360p resolution and I move to the 1080p ...
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5 votes
2 answers
408 views

Why are many DNS servers not returning the namservers for my domain correctly?

My website has become widely inaccessible and I don't know why. Up until recently I have been serving my website through cloudflare, so was using their nameservers. Recently I started using Route 53, ...
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56 votes
6 answers
13k views

Some ISPs don't charge for bandwidth used on Youtube/Netflix/Facebook. How do they monitor that? [closed]

In Poland, it is common for mobile ISPs to offer plans with limited amount of bandwidth per month, with exclusion of some popular apps. So for example all traffic from YouTube is not counted towards ...
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VPN Tunneling through Multiple NAT environment

I currently building a DIY surveillance system based off of a QNAP NAS. The NAS will store the data, control the cameras, and act as a VPN Server for external access. I've managed to get all the the ...
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Is it possible to use a DNS server as a proxy? [closed]

My mobile internet provider cuts my internet service at times before it was due, I contacted them and they did nothing about it I noticed I could still ping hostnames, thus I can connect to the dns ...
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How to diagnose source of website blocking?

When accessing sites through my ISP, certain sites don't load. The DNS resolves fine (via nslookup; also, the hosts file is fine), but then accessing them through any port times out (eg. tracert or ...
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VNC ISPSystem glitches on high resolution

I am trying to perform an installation of Android x86 8.1 RC2 on VPS through the means of ISP panel, via VNC. Here is what I see in any VNC client (noVNC, VNC Viewer): Such a bug only appears after ...
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2 votes
0 answers
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WAN failover for local mail server

I have a question about possible failover solution for internet connection to local mail server in one small office where are problems with ISP. There is Kerio Control server with public static IP 1.1....
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1 answer
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Under volumetric DDoS can I prevent ISP null-routing by turning NIC off briefly?

A server in a data center is getting a volumetric DDoS attack. Congestion starts to build up and the data center/ISP going to solve this by null-routing (RTBH routing) the server's IP address for ...
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1 vote
2 answers
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Small ISP asked to whitelist all of their IPs

We are running a dedicated server as a shared hosting for ~100 clients. This week, a small ISP asked use to whitelist the range of their IPs because all of his clients can't see our websites. I'm ...
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-1 votes
1 answer
378 views

How exactly the network bandwidth is calculated and in which layer of OSI Model? [closed]

We can see everyday our bandwidth is calculated by ISP's , Mobile Telecoms and Cloud Services. But how exactly they calculate this bandwidth? Do they count number of tcp/udp packets in layer 4? If so, ...
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1 answer
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Abuse report for spamming...abuse report [closed]

Few weeks ago, i activated on my server on automatic abuse report mail when someone try to brute force my SSH, i did it because i got an average of 3000 spamming IP each weeks. But today, my ISP send ...
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Change Of External Static IP – Two Servers Connected

I’ve recently come to manage the IT at a small organisation and am in the process of figuring out their setup (they previously outsourced IT work). They have a main server (running Windows Server 2008 ...
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Serving images is too slow in certain ISP

I'm serving Images as part of my website for a long time now, but recently images became too slow on a certain ISP! I'm hosting on DigitalOcean with a load balancer (with http2 rule) in front of ...
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1 vote
1 answer
52 views

Building reliable internet speed test tools

I'm interested in building a command-line speed test tool similar to the one used here. I started using it in a cron job to automatically check and record speeds at different times when we started ...
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2 votes
2 answers
232 views

Access two ISP at once for failover

Assumptions: Office locale with a dedicated leased line is literally a factor of 50x more expensive than broadband. I know nothing of office networking, but will hire appropriately if this is ...
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4 votes
2 answers
685 views

DNS forwarding or root hints

The author of Best practices for DNS forwarding [petri.com] recommends using the ISP's DNS servers as forwarders instead of doing the recursive lookups yourself, the main reason being performance. ...
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PTR record only visible on two public name servers

I submitted a request to an ISP (CableOne) to have a PTR record created.. 160.2.202.58 mail.huntleylaw.com I've queried 30+ Public DNS servers and I've only been able to find the PTR record on two.....
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ISP gave me 3 ppoe accounts for 3 dedicated IPs, what kind of router do I need?

I made an optic fiber ISP contract that included 1 dedicated IP addresses and 2 additional dedicated IP addresses, now when they gave me the 3 IPs I see I have actually 3 different ppoe accounts. Is ...
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site is not accessable on single ip

OUR SIDE: The website is hosted by WordPress on DreamHost server. There are not any filters in WordPress and I can't see any IP blocks on Dreamhost server. CLIENT SIDE: Client has a single internet ...
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2 votes
1 answer
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When an ISP is DDoSed, will its NOC have Internet access?

When an ISP is hit by a huge DDoS attack and its data plane is severely congested, will its Network Operations Center (NOC) have alternative Internet access? I'm curious what would be the industry ...
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Why does my network traffic appear to not go through what my router calls my "WAN default gateway"? [closed]

Bear with me a bit as I might be completely misunderstanding something. I'm a very-early-in-education networking student and at the moment I'm tinkering with my router settings while studying. I ...
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