From server cannot ping server itself by its hostname while can ping by its IP Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) 2019 Community Moderator Election Results Why I closed the “Why is Kali so hard” questionUsing ip addr instead of ifconfig reports “RTNETLINK answers: File exists” on DebianLinux Container LXC Intra Host Networking Issuescan ping google dns, but not google.de -> unknown host // worked in another networkCan't enable net.ipv6.conf.eth0.autoconfLinux server able to wget but not able to pingUbuntu 15.10 Network Interfaces NameCan not set static DNS on debianHow can I forward traffic across two Ethernet cards?Debian8 server : Can't resolve IP adresses or DNSDirect connection Centos7 (loadbalance) to QNAP (trunk)
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From server cannot ping server itself by its hostname while can ping by its IP
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionUsing ip addr instead of ifconfig reports “RTNETLINK answers: File exists” on DebianLinux Container LXC Intra Host Networking Issuescan ping google dns, but not google.de -> unknown host // worked in another networkCan't enable net.ipv6.conf.eth0.autoconfLinux server able to wget but not able to pingUbuntu 15.10 Network Interfaces NameCan not set static DNS on debianHow can I forward traffic across two Ethernet cards?Debian8 server : Can't resolve IP adresses or DNSDirect connection Centos7 (loadbalance) to QNAP (trunk)
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I host an ubuntu server at a data center and worked well for years till last night the server can not ping itself by host name. No config has been changed. Here are what it can/can not do now.
- From outside, I can ping the server both by its static IP, and by its hostname.
- From server, I can ping any website (google, yahoo, ...).
- From server, I can ping localhost, and can ping the IP of server itself.
- From server, I can not ping sever itself by its hostname.
Here is /etc/network/interfaces:
source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
auto enp5s0
iface enp5s0 inet static
address xxx.xxx.xxx.134
netmask 255.255.255.128
broadcast xxx.xxx.xxx.255
gateway xxx.xxx.xxx.129
dns-nameservers 192.168.1.1 8.8.8.8 8.8.4.4
and /etc/resolv.conf:
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 192.168.1.1
nameserver 8.8.8.8
nameserver 8.8.4.4
and /etc/resolvconf/resolv.conf.d/head:
nameserver 8.8.8.8
nameserver 8.8.4.4
and the output of route -n is:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 xxx.xxx.xxx.129 0.0.0.0 UG 0 0 0 enp5s0
xxx.xxx.xxx.128 0.0.0.0 255.255.255.128 U 0 0 0 enp5s0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
These configs worked for years. Wondering what happened? Thanks.
ubuntu networking ping hostname resolv.conf
asked Apr 10 at 20:04
SiaSia
32
New contributor
Sia is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I host an ubuntu server at a data center and worked well for years till last night the server can not ping itself by host name. No config has been changed. Here are what it can/can not do now.
- From outside, I can ping the server both by its static IP, and by its hostname.
- From server, I can ping any website (google, yahoo, ...).
- From server, I can ping localhost, and can ping the IP of server itself.
- From server, I can not ping sever itself by its hostname.
Here is /etc/network/interfaces:
source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
auto enp5s0
iface enp5s0 inet static
address xxx.xxx.xxx.134
netmask 255.255.255.128
broadcast xxx.xxx.xxx.255
gateway xxx.xxx.xxx.129
dns-nameservers 192.168.1.1 8.8.8.8 8.8.4.4
and /etc/resolv.conf:
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 192.168.1.1
nameserver 8.8.8.8
nameserver 8.8.4.4
and /etc/resolvconf/resolv.conf.d/head:
nameserver 8.8.8.8
nameserver 8.8.4.4
and the output of route -n is:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 xxx.xxx.xxx.129 0.0.0.0 UG 0 0 0 enp5s0
xxx.xxx.xxx.128 0.0.0.0 255.255.255.128 U 0 0 0 enp5s0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
These configs worked for years. Wondering what happened? Thanks.
ubuntu networking ping hostname resolv.conf
asked Apr 10 at 20:04
SiaSia
32
New contributor
Sia is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Just put your servers IP + the hostname(s) into your/etc/hostsfile.x.x.x.x somehostname.com hostname
– Michael D.
Apr 10 at 20:48
When you run thepingcommand, what IP address does it say it’s using?
– G-Man
Apr 10 at 20:56
@G-Man ping stalls.
– Sia
Apr 11 at 3:05
@Michael D, that worked, thank you! Wondering how come I did not need it before.
– Sia
Apr 11 at 3:05
add a comment |
I host an ubuntu server at a data center and worked well for years till last night the server can not ping itself by host name. No config has been changed. Here are what it can/can not do now.
- From outside, I can ping the server both by its static IP, and by its hostname.
- From server, I can ping any website (google, yahoo, ...).
- From server, I can ping localhost, and can ping the IP of server itself.
- From server, I can not ping sever itself by its hostname.
Here is /etc/network/interfaces:
source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
auto enp5s0
iface enp5s0 inet static
address xxx.xxx.xxx.134
netmask 255.255.255.128
broadcast xxx.xxx.xxx.255
gateway xxx.xxx.xxx.129
dns-nameservers 192.168.1.1 8.8.8.8 8.8.4.4
and /etc/resolv.conf:
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 192.168.1.1
nameserver 8.8.8.8
nameserver 8.8.4.4
and /etc/resolvconf/resolv.conf.d/head:
nameserver 8.8.8.8
nameserver 8.8.4.4
and the output of route -n is:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 xxx.xxx.xxx.129 0.0.0.0 UG 0 0 0 enp5s0
xxx.xxx.xxx.128 0.0.0.0 255.255.255.128 U 0 0 0 enp5s0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
These configs worked for years. Wondering what happened? Thanks.
ubuntu networking ping hostname resolv.conf
asked Apr 10 at 20:04
SiaSia
32
New contributor
Sia is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I host an ubuntu server at a data center and worked well for years till last night the server can not ping itself by host name. No config has been changed. Here are what it can/can not do now.
- From outside, I can ping the server both by its static IP, and by its hostname.
- From server, I can ping any website (google, yahoo, ...).
- From server, I can ping localhost, and can ping the IP of server itself.
- From server, I can not ping sever itself by its hostname.
Here is /etc/network/interfaces:
source /etc/network/interfaces.d/*
auto lo
iface lo inet loopback
auto enp5s0
iface enp5s0 inet static
address xxx.xxx.xxx.134
netmask 255.255.255.128
broadcast xxx.xxx.xxx.255
gateway xxx.xxx.xxx.129
dns-nameservers 192.168.1.1 8.8.8.8 8.8.4.4
and /etc/resolv.conf:
nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 192.168.1.1
nameserver 8.8.8.8
nameserver 8.8.4.4
and /etc/resolvconf/resolv.conf.d/head:
nameserver 8.8.8.8
nameserver 8.8.4.4
and the output of route -n is:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 xxx.xxx.xxx.129 0.0.0.0 UG 0 0 0 enp5s0
xxx.xxx.xxx.128 0.0.0.0 255.255.255.128 U 0 0 0 enp5s0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
These configs worked for years. Wondering what happened? Thanks.
ubuntu networking ping hostname resolv.conf
ubuntu networking ping hostname resolv.conf
asked Apr 10 at 20:04
SiaSia
32
New contributor
Sia is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 10 at 20:04
SiaSia
32
New contributor
Sia is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 10 at 20:04
SiaSia
32
New contributor
Sia is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Apr 10 at 20:04
SiaSia
32
asked Apr 10 at 20:04
SiaSia
32
32
New contributor
Sia is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Sia is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Sia is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Just put your servers IP + the hostname(s) into your/etc/hostsfile.x.x.x.x somehostname.com hostname
– Michael D.
Apr 10 at 20:48
When you run thepingcommand, what IP address does it say it’s using?
– G-Man
Apr 10 at 20:56
@G-Man ping stalls.
– Sia
Apr 11 at 3:05
@Michael D, that worked, thank you! Wondering how come I did not need it before.
– Sia
Apr 11 at 3:05
add a comment |
Just put your servers IP + the hostname(s) into your/etc/hostsfile.x.x.x.x somehostname.com hostname
– Michael D.
Apr 10 at 20:48
When you run thepingcommand, what IP address does it say it’s using?
– G-Man
Apr 10 at 20:56
@G-Man ping stalls.
– Sia
Apr 11 at 3:05
@Michael D, that worked, thank you! Wondering how come I did not need it before.
– Sia
Apr 11 at 3:05
Just put your servers IP + the hostname(s) into your
/etc/hosts file. x.x.x.x somehostname.com hostname– Michael D.
Apr 10 at 20:48
Just put your servers IP + the hostname(s) into your
/etc/hosts file. x.x.x.x somehostname.com hostname– Michael D.
Apr 10 at 20:48
When you run the
ping command, what IP address does it say it’s using?– G-Man
Apr 10 at 20:56
When you run the
ping command, what IP address does it say it’s using?– G-Man
Apr 10 at 20:56
@G-Man ping stalls.
– Sia
Apr 11 at 3:05
@G-Man ping stalls.
– Sia
Apr 11 at 3:05
@Michael D, that worked, thank you! Wondering how come I did not need it before.
– Sia
Apr 11 at 3:05
@Michael D, that worked, thank you! Wondering how come I did not need it before.
– Sia
Apr 11 at 3:05
add a comment |
1 Answer
1
active
oldest
votes
Check /etc/hosts. Probably there's a line with the name of the server and an incorrect IP
answered Apr 10 at 20:51
AMJAMJ
161
New contributor
AMJ is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yep, that was it. Thank you!
– Sia
Apr 11 at 3:03
add a comment |
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Check /etc/hosts. Probably there's a line with the name of the server and an incorrect IP
answered Apr 10 at 20:51
AMJAMJ
161
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Yep, that was it. Thank you!
– Sia
Apr 11 at 3:03
add a comment |
Check /etc/hosts. Probably there's a line with the name of the server and an incorrect IP
answered Apr 10 at 20:51
AMJAMJ
161
New contributor
AMJ is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yep, that was it. Thank you!
– Sia
Apr 11 at 3:03
add a comment |
Check /etc/hosts. Probably there's a line with the name of the server and an incorrect IP
answered Apr 10 at 20:51
AMJAMJ
161
New contributor
AMJ is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Check /etc/hosts. Probably there's a line with the name of the server and an incorrect IP
answered Apr 10 at 20:51
AMJAMJ
161
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AMJ is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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answered Apr 10 at 20:51
AMJAMJ
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answered Apr 10 at 20:51
AMJAMJ
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answered Apr 10 at 20:51
AMJAMJ
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Yep, that was it. Thank you!
– Sia
Apr 11 at 3:03
add a comment |
Yep, that was it. Thank you!
– Sia
Apr 11 at 3:03
Yep, that was it. Thank you!
– Sia
Apr 11 at 3:03
Yep, that was it. Thank you!
– Sia
Apr 11 at 3:03
add a comment |
Sia is a new contributor. Be nice, and check out our Code of Conduct.
Sia is a new contributor. Be nice, and check out our Code of Conduct.
Sia is a new contributor. Be nice, and check out our Code of Conduct.
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Just put your servers IP + the hostname(s) into your
/etc/hostsfile.x.x.x.x somehostname.com hostname– Michael D.
Apr 10 at 20:48
When you run the
pingcommand, what IP address does it say it’s using?– G-Man
Apr 10 at 20:56
@G-Man ping stalls.
– Sia
Apr 11 at 3:05
@Michael D, that worked, thank you! Wondering how come I did not need it before.
– Sia
Apr 11 at 3:05