Questions tagged [anycast]
48 questions
4
votes
2 answers
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 setup one to have a higher cost path than the…
chris
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4
votes
1 answer
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
Multiple A and/or AAAA records for the domain name…
user578638
3
votes
1 answer
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, which is a scalability concern
There are commands to…
makerofthings7
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3
votes
1 answer
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 lookup, it resolves to US, but the server is in…
Andrew Smith
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3
votes
3 answers
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 around the globe
now what: How do i setup? Will ANY…
Nick Thones
2
votes
2 answers
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@hv2 ~ # ip route get 1.2.3.4
anycast 1.2.3.4 dev eth0 …
pawel7318
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2
votes
1 answer
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.google.com [8.8.8.8]
over a maximum of 30 hops:
…
sdaffa23fdsf
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2
votes
1 answer
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 about the need for it: wouldn't have it been better…
glglgl
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2
votes
2 answers
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 some
of the name servers in the set. Most
…
Rob Olmos
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2
votes
2 answers
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 DHCP servers and chance the IP helper addresses on…
James Harton
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1
vote
1 answer
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 preferred solution to DNS load balancing. However, I…
R4D4
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1
vote
2 answers
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 198.251.86.133;
return 302…
Jacob Evans
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vote
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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 very often the traceroute shows that the server…
cnst
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1
vote
1 answer
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 solution) around the globe. Eg. one in Europe, one…
SCO
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1
vote
1 answer
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. Guess there should be a control terminal which…
roman
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