Nslookup works but ping fails linux When I execute “ping XXX” on Windows 11 (24H2), it returns “Ping request could not find host XXX” (XXX is my company’s internal network domain name), but when I execute Jun 30, 2016 · Expected behavior Ping to an internal host (a host that’s resolved by company dns) should succeed from within a container. amazonaws. adelior. 217. conf file) whereas these other tools talk directly to DNS servers listed in /etc/resolve. By all accounts, the domain and DNS is working correctly. 20. conf file. When I try and ping or wget or even apk update, it will always fail to resolve the domain name unless I manually run an nslookup command fi Jan 28, 2014 · Hello everybody!!! I’m working on my final project and it consists of doing a small network with Active Directory, DNS, DHCP, FW, DMZ, Exchange, etc, etc… Right now, I’m having a little problem with my DNS and my DMZ. g. conf has to include dns for host. Jan 4, 2025 · A common instance of this phenomenon occurs in Microsoft Windows environments, where "nslookup" returns results while "ping" commands fail. Do not edit. com * getaddrinfo(3) failed for google. nameserver 192. com" that I get "unknown host". local - also fails with ping could not find host; IPConfig /displayDNS - lists host1 as Name does not exist; NSLookup host1 - works fine and resolves router Dec 19, 2023 · In such a situation, we could use two command line tools: ping and nslookup. 1 instead of nameserver 127. 1" which is my local LAN DNS. nslookup on the other hand defaulted to doing an lookup over IPv6, which by the look of things probably isn't configured correctly, hence no reply. local (10. I can ping external IP addresses (e. 68 (and I can ping that too), and tcpdump does show both a query and a reply. This works fine in the browser, and also when I use ping. 64 bytes from server001. com, it always return ping: bad address 'google. All external hostnames work fine for both ping, ssh, dig or nslookup. com ping: unknown host api. 1. The "/etc/resolv. I am running an OpenVPN server but when Windows 10 clients connect they cant ping hostnames on the internal LAN (but can ping via IP). 101. elb. In this container, I can ping external IPs successfully. 103): icmp_seq=1 ttl=64 time=4. net. Dig fails because your server is not registered to dns. Ping host1 - fails with ping could not find host; Ping host1. For Nov 4, 2016 · dig doesn't work for all of them - your second nameserver (200. nslookup <any FQDN>. Jun 11, 2016 · After a strange glitch with a DNS-server on our network, the ping command returns "Unknown Host," but the dig (or nslookup) commands promptly produce a NOERROR response from the server. If this test fails, try the ping command with the remote IP address: $ ping -c 3 192. conf . After Ctrl + C i try nslookup again and now it works fine. ping resolves addresses using getaddrinfo , which uses Name Service Switch , configured by /etc/nsswitch. 8 google. When I nslookup 10. CentOS can ping 8. 10 nameserver 1. mycompany. km is a CNAME ( mailtest-4. com, domain2. 155) 56(84) bytes of data. Linux clients have no problems resolving DNS queries with a wireguard tunnel using the domain controllers as DNS servers. 11. The Linux resolver randomises between entries in resolv. If this works, connectivity exists. This article dives deep into the reasons behind the issue where "Nslookup works but Ping fails in Windows 11 and 10" and offers comprehensive steps to troubleshoot and resolve it. This is the sole purpose of the nslookup command. km ) and that canonical name doesn't resolve to an IP address, that's why those tools cannot get an IP address. If nslookup works but ping fails, perhaps you can fix the problem simply by adding a dot after the domain. com' But when I saw David T's post here, I decided to try it with curl. com (18. I've tried several nslookup and dig command to no avail. ping <hostname> for example. Most other software uses it. e. 0). uk) and resolves to the same, unknown public IP address. My question: What are Resolve-DnsName and ping doing differently than nslookup? My main problem is when I try to resolve the IP in Linux. ping <website name>, nslookup <website name>. Pinging the IP works fine. 40): icmp_seq=1 ttl=58 time=47. 4#53 *** Can't find dc1-main. conf is not being examined by ping for name servers. com) or ping an domain do not work. 12. Apr 25, 2019 · Recently I recognized that at one network sometimes but not always the first DNS lookup fails, but the second one is able to resolve the name: pi@pi:~ $ ping api. If this fails, the local and remote systems don't have network connectivity between them. local). docs. 2. 4 Address: 10. net Aug 2, 2022 · If the ping by name fails, try a ping by IP address. UPDATE Someone requested this info % nslookup -q=AAAA dc1-main. Everything connected in that network (2 servers) do ping the DNS server . Child DC uses parent DC's DNS server). Jan 29, 2018 · Windows 10 DNS lookup works via nslookup, but ping and other application based attempts to local network resources fail. 222 (openDNS), though it sounds like public resolution is working fine. com, it will tell me can't resolve 'google. ext fail. Dec 26, 2023 · If nslookup works but ping fails, it means that your computer can resolve the domain name to an IP address, but it cannot connect to the server at that address. com I get the correct response. 1 The local IP is my local PiHole, which I mainly use as a local DNS Server. So for instance: # curl -v google. There are two DNS Search suffix's (domain1. 05-arm-linux-gnueabihf ] Feb 13, 2015 · Ping: $ ping server ping: unknown host server $ ping server. Eg. I found that if I instead ping a hostname with May 25, 2015 · nslookup only does proper DNS resolution, which is significantly different from the Name Service Switch subsystem that your other applications use; that is to say nslookup ignores /etc/hosts and mDNS. conf" file shows the intended DNS server first on the list, and "127. conf by default and I'd guess your ping has hit the failing resolver. Information I have an internal host internalhost. 120. Feb 3, 2022 · ping asked the OS to resolve google. 222. com". I have two different FreeBSD servers (different hosting companies), both exhibit this same behavior: They pick a specific IP address (216. nslookup Nov 28, 2011 · Dig and NSlookup works, but curl fails. nslookup targetHost 208. com to 172. 53, nslookup works, but ping still fails. If the ping by IP address succeeds but the ping by name fails, it's probably a name resolution problem. [ busybox master (git hash 349d72c19) sysroot-glibc-linaro-2. google. However, pinging or wget or apt-get refuse to connect to anything, even though they do the ip lookup correctly. The nslookup command works, indicating that the DNS service is reachable and can resolve domain names. The Problem: Windows clients cannot browse with an active wireguard tunnel. Jul 5, 2020 · When I try and devices on my network by name they fail to resolve. when issuing commands like wget/curl/dig, there's DNS request for URL, but DNS always failed to response. uk (not internal. 8 Dec 7, 2016 · dig command not working whereas ping and nslookup works fine Hi, My scenario is as below. 64 bytes from 10. Apr 17, 2023 · But I cannot find an equivalent flag for ping in Linux. 8 ms But the nslookup (or host ) commands don't work without the FQDN: Aug 4, 2019 · I noticed some strange behaviour when setting up a web server on a local network. us-east-1. For example, here are the results for www. When I am trying to ping a particular domain it returns me "Unknown host" but when I run nslookup on that same host immediately it returns me the correct IP. conf is: # This file is managed by man:systemd-resolved(8). when i tried typing the hostname into a browser it redirected me to a url on the internet, so naturally i tried pinging it using the hostname but it didn't work, whereas the ip is fine. 1. However, nslookup behaves very strangely: nslookup <any FQDN> <any DC server> works incorrectly, appending example. dig, host etc will resolve the hostnames on macOS and other machines fine (and nslookup works fine on all machines). 200. 05-arm-linux-gnueabihf ] Dec 1, 2008 · When you ping the fully qualified name of the server this should then work. However, for the forwarded entries, nslookup succeeds, but ping fails, and no external internet sites can be accessed. 168. com: No answer Aug 10, 2017 · I'm experimenting with a Win10 IoT board that runs a web interface on minwinpc. I also found this thread which may or may not be of any use to me. 211. com PING server001. It's only when I ping the server's fully-qualified domain name "server01. 27 Server: 192. 0 directly onto a VM. Nslookup works fine when resolving the name of the machine and pinging works w/out issue for both IP and name. I'll have to run dhclient which sets up nameservers correctly but still hangs with no errors. NSLOOKUP works, DIG (from Linux) works, so local DNS forward and reverse zones are functional, local DHCP server provides IPs and DNS information as expected. Mar 13, 2023 · I understand that Ping and NSLookup do not use the same resolution methods. The whole issue revolves around the fact that the vendor software checks to see the target is alive before allowing connection, and I’m assuming it uses ping method because it gives a warning it can’t reach the target host and won’t let you connect. I am sure DNS server is okay. 6, I get "server01. Pinging the FQDN works fine. If I do nslookup google. <any DC server> works correctly. 227. I am using push "dhcp-option DNS 10. I ran into the same issue and it turns out that busybox is picky about the format for resolv. com, and the OS decided that it's going to return the IPv4 address to ping, probably because its IPv6 connection wasn't working. Jul 23, 2022 · nslookup and ping don’t use the same mechanisms to resolve host names. 27 But when I do $ ping pi2w ping: pi2w: Name or service not known So it appears that the Pi is serving names correctly, but resolv. Mar 26, 2013 · We have an intermittent problem on Windows 8 whereby Ping fails to find the host but NSLookup resolves it correctly. I have an Active Directory / DNS(10. 55 I am puzzled Jul 4, 2008 · Re: Dig / NSLookup work, ping fails Originally Posted by HalPomeranz Without the trailing dot ("ping laptop1") your machine is actually trying to do a lookup for "laptop1. google. 1" last. 238) for every domain that does NOT exist. com, after a fresh ipconfig /flushdns : Jun 22, 2024 · This is very strange behavior on a fresh installation of Alpine Linux v3. company. ext and nslookup host. Apr 4, 2022 · If this succeeds and name resolution works, you probably don't need to continue along this line of testing. com Server: 10. When I nslookup server01. com (192. Why is the runtime library not using the nameserver listed in /etc/resolv. domain. conf on the command line will give you rationale and overview. twilio. com dig @8. But when I use nslookup or host command it does. For example, if you previously used ping windowsreport command, try using ping windowsreport. 4 and 8. conf on myhost2; So this is not (I guess) a DNS issue as nslookup queries work fine from the container, but I can't figure out why other application (like ping or wget) can't Jul 18, 2015 · Ok, so here's the setup. When I ping just "server01", I get a response. This works already, so we have verified that the DNS works and that wolfman indeed corresponds to Jul 8, 2019 · This is a weird one: Environment: Single Windows 2016 DC (Win 2012 functional level) DHCP DNS Multiple 2008 and 2012 R2 servers (Files, SQL, ERP) Mix of Windows 10 and Windows 7 clients Issue: I have just one of 40 computer that is unable to connect to any of the file servers or internal resources, however it has no issue with resolving external servers and website and getting email from O365 Feb 17, 2012 · I would try to nslookup other local hosts, to see if the LAN DNS is functioning. dig @8. For instance, immediately after every reboot, i can't nslookup anything. But all these operations can be done successfully in the VM (outside of the container). Jul 13, 2023 · nslookup works fine; dig works fine; ping only works with ip address, not with domains; wget and curl also fail to resolve /etc/resolv. I know that ping will use the OS to resolve the name, whereas dig/host will go to the DNS server directly. com pi@pi:~ $ ping api. There must be exactly one blank between the nameserver tag and the address for nslookup to work. 224. Ping conti Ok, someone smarter than me can explain? nslookup fails, ping works, no other issues with internet Reboot fails to cure. ping and nslookup works fine. The issue could be a cable, switch, router or firewall problem. 25-2018. corp. DNS on router set to 4. To test local resolutions like that, use something that uses NSS. search. I found this thread that gave me a few things to test. 0. com Address: 192. Name resolution is the problem since that's where the failure appears. Explanation. You could also try to nslookup the hostname in question on a public DNS i. 26. Mar 28, 2022 · host, dig and nslookup can resolve domain names to IPs e. The usual explanation is that the connection is due to NetBIOS however in this case Resolve-DnsName -DnsOnly should preclude that explanation. 6. local. 30. 5. com PING nlb-api-public-c3207ffe0810c880. 8, DiG resolves www. When I ping the server's IP address, I get a response. The ping command sends packets of information to the IP address or the domain and checks for replies. 1). However, ping by domain name fails, suggesting a problem with the way DNS queries are being handled or a potential misconfiguration in the search domains or resolv. ssh -vvv xxx On the other hand, if you're using WINS, nslookup won't help you because it only deals with DNS. So here’s my setup. Actual behavior Ping hangs from within the container, even though nslookup succeeds from within the container. Both ping and nslookup work from the Mac: Mac$ nslookup internalhost. From that laptop, while connected, nslookup polls the correct DNS server, returns the right IP. Understanding Nslookup and The commands curl and ping also do not work from the workstation. nslookup specifically issues DNS requests; by default, it contacts the name servers configured in /etc/resolv. In addition /etc/nsswitch. com:80 * Couldn't resolve host 'google. The ping works but not when the Nslookup fails with "connection timed out; no servers could be reached". 103) 56(84) bytes of data. 10. However, when I use dig or nslookup, I cannot get resolve working. 8. May 29, 2018 · I am trying to complete an nslookup for a number of hosts on an affiliated domain, but all nslookups fail. All my other devices have the DNS Settings given by the main router via DHCP. It is part of libc, and man nsswitch. Sep 30, 2019 · However, neither ping or ssh work ('login' is a bash script that uses my key): christopher@HAL4:~$ ping web4 ping: web4: Name or service not known christopher@HAL4:~$ login web4 ssh: Could not resolve hostname web4: Name or service not known My /etc/resolv. Nov 19, 2018 · Waiting for help, My machine is running Linux Cent OS 7. b. 40) 56(84) bytes of data. If they nslookup the same hostname then it returns the correct details from the local LAN DNS. command and check if that works. There are two Microsoft Active Directory Domain Controller's (one DC for parent domain with DNS server and another DC for child domain without DNS server. nslookup wolfman (name server lookup: wolfman) sends the hostname (wolfman) to the DNS (domain name system) to obtain the corresponding IP address. 17 Ping fails: PS C:\Users\Administrator> ping nuget Ping request could not find host nuget. example. Oct 30, 2012 · This should make ping wolfman work. @Scaine dig, host and nslookup do not use the name service switch (as they don't need to consider other name service mechanisms than DNS). However a ping -a of the iPaddress will resolve to the correct name. 4, however, i found that DNS works for ping and nslookup but wget/curl/dig failed always. Like so: bridgetown:/etc # ping ontario ping: unknown host ontario bridgetown:/etc # host ontario ontario. conf within the pods. conf -> same output as cat /etc/resolv. com -> works; cat /etc/resolv. We open the Command Prompt window after searching through Windows search and use these commands. conf to use nameserver 1. 151. When I edit /etc/resolv. What I don't know is how to diagnose what macOS is doing incorrectly. I can ping the DNS servers (by IP address). dev. 67. Apr 4, 2024 · One of my Fedora systems will often fail to do DNS resolution. com' * Closing connection #0 curl: (6) Couldn't resolve host 'google. Is there an equivalent to Resolve-DnsName in Linux? Clarification: Jul 4, 2021 · Since today, whenever I use any docker container with the bridge network interface, DNS resolutions seem to fail for certain utilities. I can nslookup and dig an internal hostname, and I get a rapid response, but I cannot ping or ssh to the server. 4. 20 Name: nuget. co. Depending on how security is setup on your dns server you will need to manually add it or if the dns server allows updates use nsupdate. 40 (10. For instance, if I run: sudo docker run --rm \\ --cap-add= May 11, 2023 · I see Why is 'ping' unable to resolve a name when 'nslookup' works fine? but it relates to Windows and the recommendations don't makes sense for the Mac. ping and curl are trying to get an actual IP address but the answer to the resolution jenkins-deb-builder. This can be caused by a variety of problems, including incorrect DNS settings, firewall restrictions, or a problem with the server itself. com'. 1; ping myhost1 -> bad address; wget myhost1 -> bad address; wget google. 2 in your example) isn't resolving the record. conf? Feb 16, 2020 · Ping works because you are using a host file to resolve the name. Feb 7, 2023 · The ping command works fine: $ ping some-server PING some-server. Oct 4, 2023 · This is an unusual workaround, but it worked for some users. Laptop is connected to our company VPN (Juniper Network Connect 7. 0/24. 61 ms I use ping as an example because it's simple, but most of the other tools I need to use show the same results as ping. 1) on the network 10. May 2, 2023 · nslookup myhost1 -> 10. nslookup works: PS C:\Users\Administrator> nslookup nuget Server: ad-01. 27 Address: 192. So while this fails: Mar 6, 2020 · From my x86_64 Slackware/Absolute box, I can lookup hosts: $ nslookup pi2w 192. CheeseandWhine"-- it appends the domain name listed on the "search" configuration line in /etc/resolv. Nslookup works by both name Feb 12, 2025 · Hi, I’ve encountered a problem. Both ping host. 239. Jun 6, 2012 · ping: unknown host remotesystem123 But if i use IP address of remotesystem123 then ping works So, why hostname 'remotesystem123' is not working while its ping to remotesystem123's IP address works is the question ? I would like to resolve this issue such that ping works with hostname remotesystem123 as well as IP addresss of remotesystem123 Aug 8, 2013 · 2 NICs teamed for the Management 3 NICs teamed for VM001 with NLB 3 NICs teamed for VM002 with NLB Neither the host nor it’s guest servers can resolve IPs with nslookup. com +tcp; I can ping the outside world using the IP; other devices on same wifi work fine However, the browser (ERR_NAME_NOT_RESOLVED), services such as curl (Could not resolve host: www. conf. local has address 192. 27#53 Name: pi2w Address: 192. Ping fails but nslookup works. But when I tried to ping domain names, e. One easy way to verify WINS resolution (since there isn't a standard "winslookup" type utility) is to ping the target host: ping sh-server Apr 9, 2024 · Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Feb 25, 2014 · I am using Mac OS X 10. However, everything is working fine from other machines on the same network (also Linux). How can ping and the browser possibly get the IP if the more basic tools fail to do the resolve? Jan 30, 2017 · To answer why there is a difference in behaviour between ping on one side and nslookup and dig on the other side – ping uses libc resolver (which honours /etc/nsswitch. I tested nslookup and the DNS entry is there. service. Sep 7, 2010 · Now when I try to ping a server in my LAN, its name is not resolved. ifajt gyyi zkosi pybduof ltk nxdyc kpl utl scu lzxcmk estzww xayf fffyc pgfah pptc