Hi,

I am developing a C program to upload file to an FTP Server. The system
provides options to setup the ethernet interface statically or via dhcp.
I am able to upload my file when my eth interface is setup using dhcp.
The /etc/resolv.conf file gets updated with my local network's DNS
nameservers in this case. But, when static ethernet configuration is
used, after setting the IP Address, Netmask and gateway, I am
overwriting the /etc/resolv.conf file with google public DNS server
address (8.8.8.8) using the command

echo nameserver 8.8.8.8 > /etc/resolv.conf

The file is getting updated and the operation exits with error "Timeout
was reached".

I am able to "ping www.google.com" and "ping my_ftp_server" with 8.8.8.8
as the only entry in the resolv.conf file, but the curl operation fails.

I tried using OpenDNS namserver insted of google's DNS but there is no luck.

If I replace the nameserver 8.8.8.8 with the local DNS IP address that I
received during dhcp operation, as follows:

echo nameserver "local dns server ip" > /etc/resolv.conf,

I am able to complete the FTP operation.

Request help to understand the cause of the issue. Thanks in advance.

Regards

Ison Thomas
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Received on 2016-05-03