No Route to Host error and solution
I am getting error that read as No Route to Host. I am trying to ping my ISP gateway as well as DNS server but I am getting this error. How do I solve this problem?
This problem indicate networking conflicts or some sort of networking configuration problem.
Here are things to check:
Can you ping to your local router interface (such as 192.168.1.254)?
Make sure your card (eth0) is properly configured with correct IP address and router address. Use ifconfig command to configure IP address and route command to setup correct router address. If you prefer to use GUI tools:
- redhat-config-network - Works on Red Hat and Fedora Linux/Cent OS.
- network-admin - Debian and Other Linux distribution use this GUI too
Use above two GUI tools to setup correct IP address, DNS address and router address.
b) Make sure firewall is not blocking your access
iptables is default firewall on Linux. Run following command to see what iptables rules are setup:
# /sbin/iptables -L -n
You can temporary clear all iptables rules so that you can troubleshoot problem. If you are using Red Hat or Fedora Linux type command:
# /etc/init.d/iptables save
# /etc/init.d/iptables stop
If you are using other Linux distribution type following commands:
# iptables -F
# iptables -X
# iptables -t nat -F
# iptables -t nat -X
# iptables -t mangle -F
# iptables -t mangle -X
c) Finally make sure you are using a router and not a proxy server. Proxy servers are good for Internet browsing but not for other work such as ftp, sending ICMP request and so on.
See also:
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- HP-UX: How Do I configure routing or add route?
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Tags: configuration problem, correct ip address, dns address, dns server, fedora linux, firewall, gui tools, Iptables, Linux distribution, network admin, networking configuration, redhat, router address, router interface
I’m using Redhat 7.3 and running sendmail for my email but the emails are not getting out the email server which is my linux 7.3 box and if I run the command # sendmail -v -q from the command prompt, it tries to send but with an error message saying “no route to host” ?
SOS
Make sure you have correct routing setup. Also check file /var/log/message for details.
Make sure you have correct DNS setup. Finally some ISP do block access to 3rd party SMTP server to avoid spam.
On a side note RH7.2 is outdated get latest version such as CentOS 4.x or Fedora Core.
hi
very useful , my problem solved against no route to host
with regards to your suggestion “Make sure you have correct routing setup. Also check file /var/log/message for details.” above, could you tell me how to look and setup routing.
Thanks
Kumar
In the error logs I see this.
bound to 192.168.0.165 — renewal in 294 seconds.
Do I have to make any changes in the DHCP server.
Thanks