Category ‘Networking’

• TECHPULP | How to solve ‘Stale NFS file handle’ error while accessing or unmounting a NFS volume
  This error is typically seen in a system which has active NFS mount point. The NFS protocol doesn’t define any automatic way of communication for any change of NFS server configuration. For example, if a client system mounts an NFS...
• TECHPULP | How to export a NFS volume in Fedora or RedHat Linux
  NFS stands for Network File System and is a easy way to share files across Linux systems. However the downside of NFS file sharing is that shared folder can’t be protected with a password. But you can limit access to...

• TECHPULP | How to enable auto login for SSH
  This article assumes that the host name of server is “server1.techpulp.com” and that of client machine is “client1.techpulp.com“. You can replace these with your own domain names or IP addresses to suit your needs. Login to the server system to...
• TECHPULP | What is DMZ network and why is it needed
  In networking terminology, the DMZ network is defined as a network which is less restricted as opposed to corporate network (LAN) which can never be accessible to outside world directly. It is always recommended that all public servers like web...

• TECHPULP | How to disable Firewall in Fedora Linux systems
  If you have come across a problem of not able to access a service like httpd even if the server is running, most probably the Firewall is blocking the port. The quick way of checking it is to disable Firewall...
• TECHPULP | FTP - How to upload/download or delete directories recursively
  The standard FTP program doesn’t support recursive operations on directories. The ncftp command supports recursive operations. This is very useful if your web hosting supports only FTP transfer. First of all, check if ncftp command is already present in your...

• TECHPULP | How to find IP address of DNS Server in Linux
  The file “/etc/resolv.conf” contains IP addresses of DNS servers along with domain name. A example file is shown below. [neo@techpulp ~]$ cat /etc/resolv.conf nameserver 202.64.38.98 nameserver 202.64.39.98 [neo@techpulp ~]$ In the above example, Two DNS servers are configured in my...
• TECHPULP | Why my application can’t open more than 1024 or 4096 sockets in Linux
  Typically socket “open” call doesn’t fail unless you have missed out closing the previous connections using “close” system call. Typically Linux/Unix sets a maximum limit for the number of open FDs. That means you can’t keep FDs in open state...

• TECHPULP | My telnet session doesn’t respond - How to close it and get the shell back
  Sometimes the telnet session doesn’t respond and almost locks up your shell. This can be because of any of the following reasons. Your machine is disconnected from network Telnet Server is disconnected from the network Network problem between client and...
• TECHPULP | Why my netstat command is slow in Linux
  Basically default usage of netstat command makes netstat command to resolve all IP addresses to display symbolic host names. If your connection to DNS server is slow or not working, netstat command spends some time in waiting for response from...