4L Communications Ltd

System Management, Operation and Support

4L Communications can offer a range of management and support services for Unix systems and IP networks. We have the expertise and flexibility to provide management and support services for a range of scenarios, including:

• short-term requirements to fill a gap in existing resources
• medium-term system operation and support, in conjunction with staff training and mentoring to facilitate skills transfer
• longer-term need for day-to-day operational support, out-of-hours cover, or to provide a skilled escalation path
• having expertise on tap to solve the occasional problem or answer the occasional question

4L Communications have extensive experience of a wide range of Internet technologies, including:

• Over 15 years of Linux experience - dating back to 1992, just a few months after its first public release
• Other Unix variants including Solaris, HP-UX and Irix
• Custom Programming and Scripting ('C', Perl, TCL, PHP, Bourne Shell)
• Core Internet Services and Applications including:
  • Email (Sendmail, Postfix, Qmail, Exim, UUCP, Filtering, POP, IMAP)
  • WWW (Apache, SSL)
  • Web Caches and Proxies (Squid, Netcache, Inktomi)
  • DNS (BIND)
  • Distributed Systems (DHCP, NIS, NFS, CIFS, Clustering)
  • Storage Area Networks and Network Attached Storage
  • Virtualisation (Xen, VMWare)
  • Databases (MySQL, Postgres, Oracle)
• Networking equipment and technologies, including:
  • Transport media such as PSTN, ISDN, xDSL, Leased Lines, SDH, POS, WDM, Wired, Wireless and Metro Area Ethernet
  • Routers, switches, terminal servers and load balancers from the likes of cisco, Foundry, Extreme, Adva
  • Core routing protocols such as BGP, OSPF and EIGRP
  • Ethernet-based protocols such as Spanning Tree (802.1q, 802.1w), Link Aggregation (802.1ad) and VLANs (802.1q/ISL)
  • Peering management, IP address and AS Number assignment, RIPE liaison
• Securing all of the above through:
  • Secure configuration
  • Careful system management, policies and procedures
  • Pro-active management, logging and auditing
  • Tools such as firewalls and packet filters, SSH, Tripwire, IPSEC
  • Increasing Operating System security using RBAC extensions such as SELinux and Grsec
  • Authentication technologies such as Kerberos and RADIUS

For further information about our System Management, Operation and Support services, please contact us.