No Route to Host error and solution

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?

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

 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.

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