hello,

I am trying to issue the command /usr/bin/host $(HOST) and get the following reply from server :
;; connection timed out; no servers could be reached

server is in DMZ.

while issing the same command in production vlan it returns hostname and IP.

please assist


regards,
Reuven

Check that the variable $HOST exists.
echo $HOST

Next check what name servers are configured
cat /etc/resolv.conf

Then see that you can reach them
ping -c 1 -w 2 your_dns_server1
ping -c 1 -w 2 your_dns_server2

If not check check your network settings
ip link
ip addr
ip route

Check iptables rules
iptables -L OUTPUT
iptables -L INPUT

Hi,
thanks for your quick reply.

our DMZ environment does not use DNS therefor ping to DNS server will not help.
looks like /usr/bin/host is using DNS and I would liker to bypass it if possible.

regards,
Reuven

Just ping an ip address. No need for hostnames. Or use a hostname thats is in your local dns database a.k.a. /etc/hosts.

host does what host does resolve a hostname to an ip address. Dunno if there are any swtiches or options to it but I doubt it.
So what are you trying to achieve? Maybe we can just work another route.

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see man host, it begins with:
host - DNS lookup utility
host is a simple utility for performing DNS lookups.
....
usage: host name [server]
name is the domain name that is to be looked up. It can also be a dotted-decimal IPv4 address or a colon-delimited IPv6 address, in which case host will by default perform a reverse lookup for that address. server is an optional argument which is either the name or IP address of the name server that host should query instead of the server or servers listed in /etc/resolv.conf.

so you can specify the ip of dns (as server) if you would like to do so.

thanks very much zhjim and pan64 :-)

glad to help you
you just need to press YES if you want to say THANKS.

1 members found this post helpful.