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70 views

Cisco IP SLA HTTP request with frontdoor VRF

I am trying to use a IP SLA for HTTP on my Cisco ISR 4321 router to check if a website is reachable. The challenge is that I need to do that in a frontdoor VRF. I have configured ip name-server vrf ...
3
votes
1answer
375 views

Who generates all the DNS requests when I plug my public IP router to the network?

When I plug my router with a public IP address on it into the network, I get discovered after few hours to days and become 'flooded' with DNS requests from many sources. Who generates these requests? ...
1
vote
1answer
44 views

Router decision making w.r.t web browsers

Two different websites have been opened from two different browsers(for instance chrome and firefox) on the same IP Device(PC) connected to the same router. When the response comes from far end, it's ...
3
votes
3answers
1k views

How WANs work and why it is it bad to run DNS and DHCP on a router?

I have some networking questions about isolating networks and why it's bad to run DHCP and DNS on a router and should be run on a server. Question 1: What is the purpose of the WAN interface and how ...
1
vote
2answers
315 views

How are packets routed based on IP and how are those routes acquired?

Good day all, this is my first question here, be gentle in judgement Background: At university, we are covering Network Routing Protocols. Having possibly found 2 issues with current routing ...
1
vote
3answers
2k views

Can I route internal DNS requests to another server?`

I have a bunch of internal computers, accessing a specific DNS server (internal Server). I'd like to setup some redundancy, in the event that DNS Server goes down, and quickly set routes, at the ...
3
votes
2answers
3k views

What is IP-over-DNS tunnelling?

What is IP-over-DNS tunnelling please? I have seen this term used in the context of a captive portal. The idea was to redirect clients to the local web server and to force the DNS (?). It was ...
0
votes
1answer
94 views

Access hosted site from behind local network?

I have a Windows server 2012 R2 machine running RRAS and DHCP. It has two ethernet interfaces: one for incoming internet traffic, and one for the local network. This server also forwards various ...
0
votes
2answers
566 views

Why do I capture all DNS queries from everyone in the network when I port forward port 53 to my computer?

I'm seeing some things in Wireshark I can't explain. My setup is as follows: A router with a single global IP doing NAT for the devices behind it. I am also behind it with my computer. I port forward ...
0
votes
1answer
614 views

Is NAT loopback the only reason I can't view my own website from within my LAN? [closed]

I am new to this so apologies if this is the wrong place for such a question. I'm testing out a simple "hello world" website hosted at home. As we have not been assigned a static IP address by our ...
0
votes
1answer
66 views

Host Can't be Resolved Anymore

We are using an application running on a local server, which is linked to a domain-name via a DMZ in a router. Of course, the link between the ISP IP address and the domain name is established as well....
1
vote
1answer
5k views

Configure DNS Table on Sonic Wall TZ205

I just installed a TZ-205 on our company network and I can not seem to find where I would add to a DNS table. On our Linksys LRT224 there is a option to add a domain name and an associated IP. Does ...
3
votes
1answer
767 views

Router equipment and interface info in reverse DNS

Question about pages 17 and 18, of 49, at http://www.nanog.org/meetings/nanog45/presentations/Sunday/RAS_traceroute_N45.pdf It is mentioned that prefixes and numbers in DNS (when doing traceroute) ...