On 3/4/24 16:06, David Wright wrote:
On Mon 04 Mar 2024 at 12:36:54 (-0800), David Christensen wrote:
On 3/4/24 08:37, Albretch Mueller wrote:
_LINK="https://christuniversity.in/uploads/course/E&Comp_21-25_Lateral
Entry(1)_20210618043317.pdf"
I ignored the filename, and pasted https://christuniversity.in/uploads/course/
into FF. Here's the text copy/pasted off the page that was displayed.
It was accompanied by the image that is displayed at
https://christuniversity.in/images/cour-btch-bnnr.jpg
...
Just a data point.
Testing ping again:
2024-03-04 17:31:14 dpchrist@laalaa ~
$ ping -c 3 christuniversity.in
PING christuniversity.in (111.93.136.229) 56(84) bytes of data.
64 bytes from 111.93.136.229 (111.93.136.229): icmp_seq=1 ttl=49 time=273 ms
64 bytes from 111.93.136.229 (111.93.136.229): icmp_seq=2 ttl=49 time=272 ms
64 bytes from 111.93.136.229 (111.93.136.229): icmp_seq=3 ttl=49 time=273 ms
--- christuniversity.in ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 271.914/272.406/272.725/0.352 ms
2024-03-04 17:31:23 dpchrist@laalaa ~
$ ping -c 3 103.105.225.131
PING 103.105.225.131 (103.105.225.131) 56(84) bytes of data.
--- 103.105.225.131 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2060ms
2024-03-04 17:31:41 dpchrist@laalaa ~
$ ping -c 3 111.93.136.229
PING 111.93.136.229 (111.93.136.229) 56(84) bytes of data.
64 bytes from 111.93.136.229: icmp_seq=1 ttl=49 time=277 ms
64 bytes from 111.93.136.229: icmp_seq=2 ttl=49 time=280 ms
64 bytes from 111.93.136.229: icmp_seq=3 ttl=49 time=276 ms
--- 111.93.136.229 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 276.118/277.636/280.041/1.719 ms
So, same results as before -- one IP works, the other does not, and I
got lucky with the FQDN (a previous test got the wrong IPv4 address and
timed out).
Testing Firefox:
https://christuniversity.in/uploads/course/
https://103.105.225.131/uploads/course/
https://111.93.136.229/uploads/course/
All three time out.
Doing whois searches on the A record IP addresses:
1. https://www.whois.com/whois/103.105.225.131
The IPv4 address holder appears to be a small ISP with 4 @ IPv4 class C
ranges (1,024 addresses). It appears nothing is connected to the
christuniversity.in IPv4 address.
2. https://www.whois.com/whois/111.93.136.229
The IPv4 address holder appears to be a larger ISP with 1 @ IPv4 class B
range (65,535 addresses). It appears there is a host connected to the
christuniversity.in IPv4 address, but I cannot connect to its web server.
STFW for information about DNS A (Address) records, I see:
https://www.cloudflare.com/learning/dns/dns-records/dns-a-record/
What is a DNS A record?
...
The vast majority of websites only have one A record, but it is possible
to have several. Some higher profile websites will have several
different A records as part of a technique called round robin load
balancing, which can distribute request traffic to one of several IP
addresses, each hosting identical content.
So, two DNS A records for the same FQDN is allowed and can be useful.
Searching for all DNS records for christuniversity.in :
https://www.whatsmydns.net/dns-lookup?query=christuniversity.in&server=opendns
I see the two A (address) records that we have been discussing:
id 21430, opcode QUERY, rcode NOERROR, flags QR RD RA
;QUESTION
christuniversity.in. IN A
;ANSWER
christuniversity.in. 60 IN A 111.93.136.229
christuniversity.in. 60 IN A 103.105.225.131
;AUTHORITY
;ADDITIONAL
I see five MX (mail exchanger) records:
id 52477, opcode QUERY, rcode NOERROR, flags QR RD RA
;QUESTION
christuniversity.in. IN MX
;ANSWER
christuniversity.in. 60 IN MX 1 aspmx.l.google.com.
christuniversity.in. 60 IN MX 5 alt1.aspmx.l.google.com.
christuniversity.in. 60 IN MX 5 alt2.aspmx.l.google.com.
christuniversity.in. 60 IN MX 10 alt3.aspmx.l.google.com.
christuniversity.in. 60 IN MX 10 alt4.aspmx.l.google.com.
;AUTHORITY
;ADDITIONAL
I see two NS (nameserver) records:
id 57399, opcode QUERY, rcode NOERROR, flags QR RD RA
;QUESTION
christuniversity.in. IN NS
;ANSWER
christuniversity.in. 60 IN NS ns1.christuniversity.in.
christuniversity.in. 60 IN NS ns2.christuniversity.in.
;AUTHORITY
;ADDITIONAL
I find it strange that there are no A records for:
ns1.christuniversity.in
ns2.christuniversity.in
And yet dig(1) can find them:
2024-03-04 17:56:59 dpchrist@laalaa ~
$ dig @9.9.9.9 ns1.christuniversity.in
; <<>> DiG 9.16.48-Debian <<>> @9.9.9.9 ns1.christuniversity.in
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40331
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;ns1.christuniversity.in. IN A
;; ANSWER SECTION:
ns1.christuniversity.in. 60 IN A 111.93.136.227
;; Query time: 284 msec
;; SERVER: 9.9.9.9#53(9.9.9.9)
;; WHEN: Mon Mar 04 17:59:17 PST 2024
;; MSG SIZE rcvd: 68
2024-03-04 17:59:17 dpchrist@laalaa ~
$ dig @9.9.9.9 ns2.christuniversity.in
; <<>> DiG 9.16.48-Debian <<>> @9.9.9.9 ns2.christuniversity.in
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42915
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;ns2.christuniversity.in. IN A
;; ANSWER SECTION:
ns2.christuniversity.in. 59 IN A 103.105.225.129
;; Query time: 276 msec
;; SERVER: 9.9.9.9#53(9.9.9.9)
;; WHEN: Mon Mar 04 17:59:48 PST 2024
;; MSG SIZE rcvd: 68
Those IPv4 addresses do match the existing A record addresses.
I see one SOA (Start of Authority) record:
id 18177, opcode QUERY, rcode NOERROR, flags QR RD RA
;QUESTION
christuniversity.in. IN SOA
;ANSWER
christuniversity.in. 60 IN SOA ns1.christuniversity.in.
admin.christuniversity.in. 2010101511 10800 900 604800 86400
;AUTHORITY
;ADDITIONAL
Perhaps admin at christuniversity.in is a working e-mail address?
I see six TXT (Text) records:
id 21594, opcode QUERY, rcode NOERROR, flags QR RD RA
;QUESTION
christuniversity.in. IN TXT
;ANSWER
christuniversity.in. 60 IN TXT "MS=ms82463954"
christuniversity.in. 60 IN TXT "0tdv84q1587b1vq8z6g6lhxbbjzsd2jf"
christuniversity.in. 60 IN TXT "ZOOM_verify_95Xn7cn5cTBX0YsQ9COsZy"
christuniversity.in. 60 IN TXT "MS=61A57F802201FA74460EE120E17085C57609A1C4"
christuniversity.in. 60 IN TXT "v=spf1 include:_spf.google.com
include:zcsend.in ~all"
christuniversity.in. 60 IN TXT
"adobe-idp-site-verification=7b1f2b5d56e53e37d862a4dd5fc9e9308acd04ed7ddd7b669dd9dbb91cab183a"
;AUTHORITY
;ADDITIONAL
AIUI TXT records are tied to authentication and authorization for
various Internet services.
Doing the same lookup for my domain (holgerdanske.com), I only see a
portion of the DNS records that I see via my hosting provider's control
panel. So, there could be more DNS records for christuniversity.in that
we are not seeing.
David
