# Appendix

## Appendix A: Summary of Common Commands

### Data Link Layer Commands

* ARP
* Route

![Data Link Layer Commands](https://2111411451-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F1nxy7NopViqjBU3Dmowx%2Fuploads%2Fgit-blob-93b3237238840f080ba23f898794cda4d7ab43ed%2Fappx_commands.png?alt=media)

### Network Layer Commands

* iptables

![Network Layer Commands](https://2111411451-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F1nxy7NopViqjBU3Dmowx%2Fuploads%2Fgit-blob-6c3a07e81d548a4d79605d6e4dc3cdd884146d18%2Fappx_netfilter-iptables.png?alt=media)

## Appendix B: Sample Configuration Files

## Appendix C: Troubleshooting Guide

### DNS Troubleshooting

![dns-troubleshooting](https://2111411451-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F1nxy7NopViqjBU3Dmowx%2Fuploads%2Fgit-blob-a70227197d2631ccc8e27a33dfe6e99dafb95e2b%2Fappx_dns-trouble-shoot.png?alt=media)

## Appendix D: Others

### Exit Codes

![exit-codes](https://2111411451-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F1nxy7NopViqjBU3Dmowx%2Fuploads%2Fgit-blob-cd9a3bdccd3aac0dd52226b5a5db092a32f35025%2Fappx_k8s-exit-code.png?alt=media)
