Questions tagged [anycast]
The anycast tag has no usage guidance.
52
questions
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IP ending in all zeros: valid (for /128) or possibly confusable with anycast?
Host Europe assigned a VM I just rented from them an IP address ending in all zeros (2xxx:xxxx:xxxx:xxxx::/128).
I claimed this as possible interop problems as addresses with the last 64 bits all ...
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53
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Route outgoing packets from VM to GRE tunnel from which income packets came from? (TCP flows)
We have a network infrastructure with Anycast IPs on edge servers in multiple countries, those servers encapsulate traffic in GRE tunnels to endpoint nodes with virtual machines
Currently we route all ...
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119
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Listening on all interfaces, multiple servers
I have a server listening on all interfaces for a port (using go net.Listen("tcp", ":{port}")). I also have backup server with the same code, to start if first server fails. Both ...
0
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109
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Will anycast failover to the next server if it encounters a 404 from an nginx server?
I know that anycast will failover for layer 3 issues but will anycast failover if a file is not present? I.E. like a 404?
It seems like it won't, like as long as nginx returns something anycast will ...
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0
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102
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How does hybrid unicast/anycast work for global load balancing?
In the Dropbox Edge network write up, the author mentions that they have taken a hybrid approach by announcing both unicast and anycast ip of PoP.
One can enable this hybrid GSLB by announcing both ...
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22
views
some solution to start the instance
The [start] operation type failed with the message "The zone 'projects / meta-view-335220 / zones / europe-west4-b' does not have enough resources available to fulfill the request. Please try a ...
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293
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How to implement Anycast DNS
Our website hosting provider uses Anycast DNS and has a zone file with a set of nameservers as shown the this screenshot for the zone www.example.com
However the nameservers for the domain are ...
- 99
0
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4k
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How do I configure Bird to use OSPF?
I'm configuring a network with the following topology:
What I need to do is to provide a service that is available by Anycast and that is announced by OSPF. I managed to configure OSPF on the routers....
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2
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138
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Is it possible to have a IP belong to multiple ASes?
I'm wondering if it is possible to have same IP address belonging to multiple ASes?
especially in case
Anycast IP, so we could provide the node in different ISP's networks?
A router, so that we can ...
4
votes
1
answer
327
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Load balacing email servers: MX vs A/AAAA vs Anycast IP
I'm curious about what are the differences and considerations when implementing email server load balacing between these three methods:
Multiple MX records with the same priority/preference number
...
user578638
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239
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How do you port forward with Anycast?
I try to Forward a Port from an Anycast IP (111.111.111.111), which has multiple POP's and the Port should be then forwarded to a single Unicast IP (10.0.0.1).
All of them are reachable over a VPN, ...
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If public IPs are pinned to a single AS, how does BGP anycast work?
It is my understanding that public IP blocks are assigned from IANA, which assigns sub-blocks to RIRs, which assigns sub-blocks to ISPs, which assigns sub-blocks to individual ASs as outlined in this ...
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188
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Does anycast allow for alternate routes to be attempted?
A bit of a bodged up title but I don't know enough of the subject to come up with a more suitable one.
I've read time and time again that anycast is a great solution for load balancing and is the ...
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120
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How many anycast ips can be created per /24 net?
How many anycast ips can I create with one ipv4 /24 net? I know I need a whole /24 net to do anycast, but how many of those ips can I do with one? With a anycast ip address I mean one address for doke ...
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164
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Is IP Anycast helpful for fast loading website? [duplicate]
I'm not sure but before I purchase http://dnsmadeeasy.com IP anyast service I really need to know What is IP Anycast actually and how does this work? Can anyone explain in simple sense?
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nginx 302 redirect only naked IP
I'm trying to setup a 302 redirect if someone enters the IP address, but 301 all other requests to the www.subdomain of that domain.
server {
listen 198.251.86.133:80;
server_name 198.251.86....
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3
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4k
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How do big companies like Youtube load balance traffic with only one IP? [duplicate]
Examining the A records for youtube.com (for example), I see only one IP address.
How can this be possible, given the volume of traffic they handle?
Do they use anycast with load balancers behind it?...
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329
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With anycast DNS, is it the IP or the FQDN that is doing it?
i am somewhat new to anycast and i want to know if it works on the IP or the FQDN.
The reason i ask is, i have a anycastDNS account with a provider. And i would like to use my own domain name to make ...
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86
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Is it possible to have 1 IP Address for a cluster of recursive DNS Servers?
Is it possible to have 1 or two static IP Address for a cluster of recursive (but not open relay) DNS Bind Servers that are being hosted on different cloud vpn providers? We want to have two DNS ...
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How do I get anycast for my servers?
I want to have anycast for my web service, but I cannot find any information on how to achieve this or any company that can help.
I've found loads of companies offering anycast DNS, but that's not ...
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268
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Do anycast addresses imply IPv6? [closed]
From what I understand, as a random user on the Internet, you cannot really know if an IPv4 address is unicast or anycast. However if you ping that IPv4 from two hosts physically located on two ...
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What interaction is required for a Windows server and Cisco router to setup and destroy a Multicast session?
I'm trying to understand how Multicast actually works, and have read numerous articles and Wiki pages, and have gathered this:
A multicast address takes up state on the router of the membership, ...
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How does anycast work with tcp?
TCP, being stateful, should require subsequent packets to reach the same server. (Stateless) HTTP runs on top of TCP, and CDN's can use anycast.
So how does TCP work with anycast? What if the syn ...
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2k
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ip route get recognizes address as anycast
# ip route get 1.2.3.4
anycast 1.2.3.4 dev eth0 src 5.6.7.8
and the question is how does it know the address is an anycast ? (which apparently is true).
UPDATED:
Present as anycast route:
root@...
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3k
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DNS servers already use anycast. Will adding more IPs enhance scalability?
RFC 1034 requires us to assign at least two IP addresses for DNS servers. However, redundancy can already be achieved by a single IP address if we use anycast addressing. BGP anycast seems to scale ...
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31k
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How to determine IP address is unicast or anycast? [closed]
I searched the Internet and unable to find an answer. Anyone can help?
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478
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Why an anycast server is so far away / slow? How does BGP anycast work?
I've tried doing a couple of traceroute tests to the DNS servers of Rage4, which are anycasted from many parts of the world (supposedly, from 30 different locations).
What I've experienced is that ...
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59
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Distributed webservice, geolocalized access
I wish I could deploy a very low network latency webservice (running Linux).
I was thinking about distributing some instances amongst several dedicated servers (eventually VMs, but not the preferred ...
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169
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Anycast network - steps required to implement one?
As part of our cloud-based security service, we have a DNS server deployed in the cloud. Instead of providing different IPs to customers in different geo-locations, we want to use a unified Anycast ...
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235
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Geographical proximity based IP translation
I'm currently using Amazon's EC2 for my socket application to which mobile devices connect via an application I've written (it uses the server's IP address to connect).
I'm looking for a Load ...
- 157
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What is an anycast with controlled access
I'm interested in how anycast works. There are two ways how a transmitter sends a packet to the receiver. I'm interested in how anycast with controlled access works. How a destination host is chosen. ...
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Anycast DNS -- how do you deal with TCP DNS requests?
Let's assume I have setup a pair of anycasted DNS servers on my internal network using bird and they're just talking OSPF to my core routers. I've found this on the internet and made it happen.
If I ...
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Practical Anycast
I've read How can I send visitors to the closest server using DNS? post, but there's still some thing, on a practical level that I don't understand.
Say I have two servers. One in NY another in Paris....
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Transparent geographical DR website failover
We've already got webservers that are loadbalanced. And even though outages shouldn't happen, they do, for a variety of reasons. (central switch failure, misconfigured ISP routers, backbone failures, ...
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How to find out the location of Google IP number: e.g. 209.85.143.94
I am building DNS service and I need to find out location of DNS servers querying me. Apparently anyone who is using Google public DNS like 8.8.8.8 is coming from Google /17 network, and if I do geoip ...
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401
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Traceroute (tracert) anycast address on Windows strange behavior
Tracing route to d.resolvers.level3.net [4.2.2.4]
over a maximum of 30 hops:
1 25 ms 27 ms 26 ms d.resolvers.level3.net [4.2.2.4]
Trace complete.
Tracing route to google-public-dns-a....
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887
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Will anycast helps me in my case and how to implement it?
I have several servers with different IPs, deployed in different datacenters (mostly geographically close to our users). Let's imagine that this is simple web servers.
What I'd like to have is a ...
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264
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DNS servers via RA in IPv6
Some time ago, RFC 6106 was created, which states how a router tells the clients about the DNS server to be used.
It is a new standard, it has to be implemented, which needs time etc.
I'm courious ...
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3
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13k
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What is the difference between Anycast and GeoDNS / GeoIP wrt HA?
Based on the Wikipedia description of Anycast, it includes both the distribution of a domain-name-to-many-IP-mapping across many DNS servers as well as replying to clients with the most geographically ...
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How to geolocate a server using an anycast ip?
Usually an anycast ip can be located say in the US, but the server itself thats sending the request is located in Europe. I'm wondering if there's anyway of finding out where the server is located.
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What is the difference between unicast, anycast, broadcast and multicast traffic?
I have never had the privilege of working in an environment that required complicated routing or if it did require it, it was handled upstream of me. I've always used very simple static routing ...
user62491
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Is there a way to set up Avahi to implement "anycast name resolution" on a LAN?
First, some background: We've got a lab containing a handful of dedicated Linux servers that run on an isolated LAN. All the servers run the same OS (Debian Linux) and the same proprietary server ...
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What is needed to use anycast IPs?
So, there're a bunch of questions on SF about the uses and how anycast IPs are cool. My approach is something more practical. What specifically I need to have to use one of those addresses?
Do I need ...
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311
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Scanning or identifying anycast IPs
I'm trying to find a way of "identifying" anycast IPs. This turns out to be rather tricky, as it's (usually) dependant on BGP routes directing you to the nearest available host.
What are common ...
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778
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DNS Resolver Speed Techniques
I recently received a reply to my concerns about some DNS servers being slower than others despite all servers being anycast:
In practice, most resolvers won't be
impacted by the slower paths to ...
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268
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Is it possible to determine how may servers is connected to an anycast address?
It's possible to set up several servers with the same IP-address, on the internet,
using anycast address. Using routing protocols , the server geographical closest to you
responds to queries.
I ...
LopLop
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3
answers
1k
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Simple Anycast Howto?
some DNS providers give me anycast, like:
http://web.easydns.com/DNS_hosting.php
Now what do i do to get it working?
1. Buy "DNS Hosting package" from them
2. Have some servers with the same IP ...
Nick Thones
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215
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Is this anycast behaviour correct?
When connecting to an service provided using anycast, I am experiencing different behaviour depending on whether the request is made using TCP or UDP.
With TCP, the request is made to address A, and ...
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What's the piece of hardware listening on Facebook's or Wikipedia's IP address?
I am trying to understand how massive sites like Facebook or Wikipedia work, for my intellectual curiosity. I read about various techniques for building scalable sites, but I am still puzzled about ...
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N-way DHCP redundancy with ISC dhcpd and anycast ip helpers
We're implementing a new IPAM solution across all our campuses and are using bind with anycast to provide 8-way resiliency for all our DNS servers. I would like to be able to do the same with our ...
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