Questions tagged [isp]

Questions relating to the operations of ISPs and interacting with them.

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18
votes
2answers
4k views

Is it common for ISPs to connect to each other directly?

I'm reading up on the relationship between latency and ISP interconnectivity (that higher ISP interconnectivity results in lower latency, which makes sense to me). My understanding is that IXPs ...
11
votes
2answers
3k views

How can ISPs on one continent connect to ISPs on another continent?

How can ISPs on one continent connect to ISPs on another continent? From a physical layer standpoint? Say one ISP is located in Asia and another one in Europe how would they connect their fiber ...
11
votes
2answers
1k views

Who pays for traffic when it transits multiple providers

TLDR Question: Who pays for traffic when it transits multiple providers Original Question I know there are a great many sites out there with this question and answer, but as yet I have not been ...
8
votes
2answers
4k views

Single Public IP Address for multiple physical locations

Is it possible to get or set up a public IP address that is load-balanced between multiple physical locations or sites? It may be something like a virtual IP address (VIP), which points to multiple IP ...
7
votes
2answers
1k views

How do routers on the backbone avoid IP address conflicts?

As the title suggests, how do ISPs, and other networks connected to the backbone ensure that their host network address isn't already in use by another backbone node, as there is no controlling device ...
7
votes
3answers
2k views

Two ISP bgp topology?

We use palo-alto firewall as an internet gateway. We have 16 static ip-addresses. One is used for outbound traffic (users browse internet) . The rest is used for inbound traffic (mail server, ...
7
votes
1answer
3k views

Problem with VPN tunel from remote location through ISP (PPTP)

I have network situation like this: ISP Router (modem) - device given to us by our ISP - modem & router in one but it is set into transparent mode - ISP say so ;D we have to find it that it is ...
6
votes
2answers
8k views

ISP edge router configuration

I need to configure Cisco 2901 router to route between interconnect block and usable ip block. Circuit is fiber 30Mb/s I got this info from ISP provider: IP space: Interconnect block - 50.204.xxx.80/...
6
votes
1answer
671 views

Who assigns IP s to the ISP s?

How a particular ISP get it's IP ? Is there any centralized authority to distribute IP s ?
6
votes
2answers
4k views

Fortigate 100D internet on VLAN wan port

I am fairly new towards Fortigate firewalls and I am trying to set up one FortiGate 100D running firmware v5.0 as a router for a hotel network. I have 2 ISPs using PPPoE connection that runs on VLAN ...
5
votes
2answers
4k views

Layer3 vs Layer2 LACP

We have ISP link 4x10G LACP Layer2 and now we are upgrade to to 8x10G LACP, currently i have created VLAN interface to terminate that link because it L2 Now i have option to decide to go with L3 or ...
5
votes
2answers
279 views

Missing major ISP's from local major IXP's?

I read all the posts on this site on IXP's and my question remains. Any clarity that anyone can bring to this topic would be much appreciated. I have trying to get a better mental big-picture of how ...
5
votes
1answer
200 views

What does NAT64 do which can't be done by deploying IPv6 + NAT444?

Why was NAT64 developed? What does it do that can't be done by deploying IPv6 + NAT444, and allocating your customers a (public) IPv6 and a (private) IPv4 address (behind a shared public IPv4 address)?...
5
votes
2answers
958 views

Internet structure and ISP networks in detail

I am studying about internet structure, ISPs and their interconnection. However, I have trouble connecting some terms and understanding the greater infrastructure of internet in more detail. I will ...
5
votes
3answers
319 views

IPv4 public address

I know the basics of NAT technique and public/private IP addressing but I still have one conflict. Let's say that my private address is 192.168.1.2 and my public one is 180.180.1.2. If I ping 180.180....
5
votes
1answer
393 views

Autonomous System Number overlap confusion

I'm really confused. I have a list of all the AS numbers and their "description", which I got from MaxMind. I thought the ASN system was pretty straightforward, but let me show you my confusion. Take ...
5
votes
2answers
211 views

Can you become your own ISP?

How exactly does an ISP connect you to the vast network of computers which is the internet? In my area there are several ISP's. For example. Bell, Rogers, and Cogeco all connect you to the "same ...
5
votes
2answers
3k views

Clustered ASA with Dual WAN Redundancy

Let's assume there are two firewalls (ASA) clustered together and two routers (1800 and 2900) each with it's own WAN link. The two routers are managed from the same ISP (it's just link redundancy). ...
4
votes
1answer
4k views

What's the difference between autonomous systems, ISPs and RIRs?

First of all, I am not sure if I can ask this question here, and, if not, I appreciate that you indicate me the best website to ask this question. I have been reading about ASs (Autonomous Systems), ...
4
votes
1answer
221 views

Prefix hijacked by another ISP

I had the <sarcasm>privilege</sarcasm> for the second time in 10 years to have one of our smaller prefixes hijacked. I have a branch office with a /27 assigned from ISP-A PA space ...
4
votes
1answer
665 views

Why doesn't ISPs reset DSCP at the edge before delivering traffic to customers?

Some ISPs are doing QoS based on traffic type (online streaming), such as Comcast and Cogent. Why don't they reset IP DSCP at the edge so it is not as obvious that they are doing some kind of traffic ...
4
votes
2answers
510 views

What provision does DS-Lite, as used by ISPs, have to provide IPv4 blocks to CPE?

I run a small ISP for a rural community in England. There are around 350 residential properties and 15 small businesses. Three of these businesses run systems that require two consecutive IPv4 ...
4
votes
1answer
706 views

Cisco / Spanning Tree on Access Ports from ISP

Please excuse my ignorance & noobishness. I have a switch which has two different point to point connections, these both plug into access ports & have their own VLAN. These two point to ...
4
votes
1answer
214 views

Very confused with routing

I'm having a hard time understanding some "basic" things... I know a bit about configuring routing using CISCO packet tracer exercises (static routers, rip, ripv2, ospf, eigrp), but I have a doubt ...
4
votes
3answers
9k views

Can I set two gateways or more on the same subnet with NAT on a Cisco router?

Let's say I have the the following configuration on a Cisco router. ISP 1 Connected and configured into GigabitEthernet8. VLAN 1 192.168.0.0/24, NAT configured. Gateway is 192.168.0.1. ISP 2 ...
4
votes
1answer
198 views

/16 and /24 routing from ISP

For a long time we had /24 from our ISP with a static route. Now we would like to have our own routers and do BGP on our own. Our ISP says your block is on our 16 so it may create routing loop. How do ...
4
votes
4answers
467 views

Advertise downstream customer-owned /24 without BGP-Peering

First post, so I apologize if I don't lay things out clearly, or if this is the wrong forum. We are a small/regional ISP. We have a customer who has a couple of /24s (not purchased through us), and ...
4
votes
1answer
580 views

BGP routing based on ARIN info

I have discovered weird routing from our ISP all related to BGP. Here is the scenario (real-one). - there is a /19 prefix bought about 10 years ago, which was registered with ARIN authority. - as ...
4
votes
2answers
242 views

How do you account for unreliable ISPs?

I maintain internet for a small business in a third-world country, and I am forever struggling with unreliable service from our ISPs. Our current setup uses a Peplink Balance 580 for load balancing, ...
3
votes
4answers
715 views

Can I make 2 ISP providers' IP addresses into 1 IP address?

We have 2 ISP providers (X, Y) and we have connected the ISPs to a core switch>Sophos firewall>Switch rack>end user (LAN & WiFi). This ISP works on fail-over mechanism. The issue here is that we ...
3
votes
2answers
350 views

Is the Slow-Start algorithm responsible for ISP speed throttling?

I've been looking up how ISPs manage to cap a user's network speed given the theoretical limit of the infrastructure is usually much higher than the speed ISP's sell. I've stumbled across the TCP slow-...
3
votes
2answers
474 views

BGP send community for individual IP

We have BGP running over default route for x.x.x.x/24 subnet, but yesterday after talking to ISP they said if you want to send traffic over to their specific peer ISP then you need to use 65000:170 ...
3
votes
1answer
3k views

Multi-homing and BGP routing with less than /24

Background: We own /24 as well as /23 blocks provider independent. I am talking to an ISP, say ISP-A for a 10G line with a IPVPN line (2 links - actual inbound + IPVPN link for clean traffic when ...
3
votes
3answers
2k views

Multihomed Internet edge without BGP. Overlapping routes, a viable design?

While the industry is preaching cloud in every market, and users, whether eagerly, reluctantly or unwittingly start falling in line everywhere, few seem to talk about the actual fabric of the ...
3
votes
1answer
126 views

Public and Private IPs

I wondered if someone could explain this to me. At work we have a firewall that connects to the Internet and has an external IP configured on it via DHCP. The firewall's WAN port connects to an ...
3
votes
1answer
267 views

Is DSLAM connected to BRAS through PSTN?

I am searching for any real world example to understand how the internet traffic reaches the ISP. I tried to search google for an answer I found that it is connected through ethernet. But I want real ...
3
votes
1answer
984 views

Could accessed sites over an SSH tunnel be tracked by ISP? [closed]

I created an SSH tunnel and using it as SOCKSv5 proxy on Firefox. I checked whatismyipaddress.com and some other sites, they could not detect a proxy on my computer and shows my location on the server'...
3
votes
2answers
277 views

How ISP identifies a device on an LTE network?

I have an LTE CPE which has been provided by an ISP. When I tried to put the SIM into another device, it connected to the network but instantly got disconnected from the network. There should be some ...
3
votes
1answer
829 views

What's the difference of TR-069 and Point-To-Point protocol?

I've read my ISP, Telecom uses a Point-to-Point regarding the ADSL networking over ATM nowadays (which is rarely used in my country, and it's non-commercial). My friend told me it actually uses TR-069,...
3
votes
1answer
141 views

Service Provider inbound routing problems before using communities

As I understand it Service Providers used to use BGPs local preference for manipulating outbound traffic and AS Path for manipulating inbound traffic before they used communities. As the internet grew,...
3
votes
1answer
173 views

P2P Applications and ISPs

My book says that because most ISPs support asymmetrical bandwidth usage and so support greater downstream traffic than upstream, that P2Ps somehow put stress on the ISP due to this? I don't ...
3
votes
1answer
340 views

ISP lab GNS3 - BGP route exchange

I'm trying to develop an understanding of the WAN/ISPs. Eventually I'll build up to MPLS, but for now I'm trying to lab up a notional, basic ISP: R1, R2, and R4 are PE routers. They've successfully ...
3
votes
2answers
243 views

BGP source base routing question

This question is little convoluted to explain but i will try my best, I have following scenario. I have one ISP and i am getting 2x40G drops which you can see in diagram Link-A and Link-B (Both ...
3
votes
2answers
165 views

What does ISP's Internet speed actually mean

Sorry if it's irrelevant for this forum, but I couldn't find any good answers online. I know that "Internet speed" isn't a stable thing, and the rate of getting a something online, for example ...
3
votes
1answer
797 views

Cisco LNS and per Customer VRF

O.P. Hi , I am trying to configure a Cisco LNS with VRF per Customer. Each customer that dial (PPPoE) to the LNS will bond to the appropiate VRF. The VRF will be assign according to the RADIUS AV-...
3
votes
1answer
205 views

WISP Network Edge Device - Router vs Switch

I am faced with an issue right now working for a small rural WISP. We have roughly 250 wireless customers throughout our area using Ubiquiti radios. Our main fiber drop comes in from a larger ISP on ...
3
votes
1answer
359 views

ISP connections Vs IX Connections

I would like to know the difference between ISP connections and IX connections? Basically we are evaluating some of the ISPs to get our edge circuits. While doing some research on it, came across to ...
3
votes
2answers
582 views

Juniper SSG and multiple interfaces

Okay guys I have a conundrum on my network, I do not know how it is working, I just know it does. I have a Juniper SSG firewall with 3 different ISPs. I have traffic coming in through the 3 interfaces,...
3
votes
2answers
230 views

How do broadband optical transmitters work?

So I'm a hardware engineer learning about networks, and one interesting subject that my book glassed over was how hybrid fiber-coax networks work. One thing that was throwing me off was that the ...
3
votes
0answers
98 views

How many people share 1 Mbps of an ISP backbone? [closed]

We all know that all consumer based internet connections are shared and that ISPs protect themselves with "best effort" contracts, also we know that a client's 50 Mbps (for example) connection speed ...