Category: Networking

Linux Routing Memos

These are just small hints and memos what to do on a Debian Linux setup. This is not a complete guide on doing a secured routing environment with Linux. /etc/sysctl.conf: net.ipv4.ip_forward=1 Configure /etc/network/interfaces iptables -t nat -A POSTROUTING -o <upstream_interface> -j MASQUERADE apt-get install iptables-persistent apt-get install iftop apt-get install conntrack conntrack -L -s 10.11.1.10 […]

Zabbix Components and Ports

Zabbix monitoring system consists of components that communicate with each other. Here is a summary of the TCP ports and some configuration characteristics of various connections. Active agent: The Zabbix agent periodically asks the Zabbix proxy (or Zabbix server, if configured to use the server directly) for the list of items that should be collected, […]

Junos Default Applications

From Junos 12.1X47-D25.4 on SRX240H2: markku@srx> show configuration groups junos-defaults applications # # File Transfer Protocol # application junos-ftp { application-protocol ftp; protocol tcp; destination-port 21; } # # Trivial File Transfer Protocol # application junos-tftp { application-protocol tftp; protocol udp; destination-port 69; } # # Real Time Streaming Protocol # application junos-rtsp { application-protocol […]

Juniper SRX Traffic Processing

Some pointers to documentation in juniper.net that describe the traffic processing in Juniper SRX platform: Juniper Networks Devices Processing Overview (Junos 12.1X47) Flow-Based Processing Feature Guide for Security Devices (Junos 12.1X47) SRX Getting Started — Troubleshooting Traffic Flows and Session Establishment (KB16110) Short version of the processing order: Per packet policer Per packet filter For […]