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Iptables Upwork freelancers typically receive a client rating of 4.88.

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Last updated: August 1, 2015

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  1. Panayotis Tsiamis

    Panayotis Tsiamis

    Senior Systems and Software Engineer

    Greece - Last active: 4 days ago - Tests: 7 - Portfolio: 14

    Systems and Services Engineer, with 12+ years of working experience. Interested in researching, administrating, debugging, tuning and developing platforms running on UNIX like Operating Systems. Able to troubleshoot, identify and solve problems in software, network or kernel layer. Always willing to learn and experiment new technologies for creating high availliability platforms, that could described as "state of the art" or "cutting edge" technology. Specialties: • Unix Like Operating Systems Specialist (Solaris / Linux ). • TCP/IP Network technology • Very deep level of knowledge on Machines hardware and OS Kernels internals. • Troubleshoot/Tune/Debug; System Services, Operating Systems • Mail Services Expert, Qmail-Ldap Specialist. • Network: Cacti/MRTG, Nagios, Cisco Netflow • Databases: PostgreSQL / MySQL / Oracle / LDAP. • Programming: Perl, Ansi C, bash, awk, sed, php etc • Internet Services: mail, http, radius, ftp, ssh, irc etc.

    $30.00 /hr
    412 hours
    0.00
  2. Leonel matías W.

    Leonel matías W.

    Network Security Consultant/ Linux Sysadmin Senior

    Argentina - Last active: 09/16/2014 - Tests: 2

    In LinkedIn, you can see a full profile: https://ar.linkedin.com/in/leonelwainer/en Some of the given services are: Information Security Audits An assessment is conducted to identify weaknesses on the IT infrastructure of your organisation. The attacks will be carried out in a controlled environment, using the same tools, techniques and methodologies that use a black-hat hacker to compromise the security of your organisation. Some of the technologies that we manage are: - Penetration Testing - Vulnerability Assessment (VRA) - Wireless Hacking - Audit / Assessment / Assurance Virtualised Environments - Audit / Assessment / Assurance SAN / NAS Managed Security Services (MSS) Managed Security On-Site (MSO) A specialised assigned resource will work at your facilities to operate and manage security systems, assisting the client in the verification, compliance and control of existing security policies in your organisation. Managed Security Monitoring (MSM) From our SOC (Security Operation Center) will monitor, remotely operate and manage your security systems that you already have installed on your network or in cases, if posible, remotely install them. Incident Prevention and Response Services Oriented on problem solving and data / connectivity / infrastructure recovery after an incident, used to address such complex and fast-growing attacks as data theft, network attacks, internal sabotage threats. A service 24 * 7. Service implementation: This service includes the design, planning and implementation of security solutions: - Firewalls - IDS / IPS - SSL VPNs - Strong Authentication Forensic Services. When you need to know that was exactly what happened, as it was and where it originated, we appear, using the latest forensic techniques we can determine all this information and more. Staff training service. Education and training of your employees, so that they are aware of how to respond and prevent threats from a digital flood of the global world.

    $38.89 /hr
    0 hours
    0.00
  3. Viktoria A

    Viktoria A

    Technical Support

    Russia - Last active: 24 days ago - Tests: 7

    I have 3 years of experience working as a Linux Administrator where I gained extensive knowledge in this field. I am familiar with installation, configuration, patching and upgrading systems. I worked mostly with CentOS but also with Ubuntu, Debian and FreeBSD. In the last 3 years I installed and managed servers and services like Apache/Nginx/lighttpd, MySQL, Postfix/sendmail/exim/dovecot/courier, DNS servers, squid and a lot more. I can install, configure and maintain any piece of software you need.

    $7.00 /hr
    0 hours
    0.00
  4. nitin ray

    nitin ray

    System Administrator

    India - Last active: 1 day ago - Tests: 3 - Portfolio: 2

    Results oriented technical expert offering over 6+ Years of comprehensive experience in different capacities in Information Technology primarily in the areas of System Administration and IT Consulting. Experience in Linux and Window Server Technologies

    $11.11 /hr
    156 hours
    0.00
  5. Kundan S.

    Kundan S.

    System/Network Engineer

    Nepal - Last active: 3 days ago - Tests: 4 - Portfolio: 1

    I have been doing the system/network administration for last 6 years. My core area of work involves setup, maintain and troubleshoot system and network administration. I had successfully implemented and troubleshoot various system and network administration. My work platform includes (but not limited to ) Microsoft, Cisco, VMware, Citrix, Linux, IBM, SAN, Veritas etc. Below are the services which i have been providing to the organizations Microsoft platform : Active directory on w2k/w2k3/w2k8. IIS 6/7 web server/application server/file server/ smtp component for relaying. Certificate services as PKI in w2k/w2k3/s2k8. Visual SVN as subversioning and repository. Exchange 2003/2007/2010 and MDaemon for messaging solutions. WSUS, RDS, Terminal Services, Hyper-V DNS, DHCP, RRAS, Network Policy services. IPSec services PPTP and L2TP VPN Server. Kernel Debugging with Microsoft Debugger and kd tools SQL server 2008 Database administration. VBscripting for standalone and Active Directory environment. Linux services: LDAP with and without samba server. Qmail, postfix, Exim and sendmail as message transfer agent. Dovecot and courier as IMAP and POP3 server. smtp-auth, spamassasin, SPF with linux MTAs. Apache as webserver, apache and git as version control server . ssh server with and without password (with certificates and passphrase). VNC , screen as terminal services. oracle, mysql and postgresql on linux/unix. IPsec site to site and ssl vpn using freeswan, openswan and racoon. linux as firewall gateway using bash/perl gateway along with iptables, psad, and snort. bandwidth shaping policing services using htb and tcng. Voice server based on sip with h.323 support based on asterisk (trixbox, elastix, go-autodial ) with vicidial. quagga/zebra as advanced routing solutions. squid 2/3 cpanel/whm Amanda/zamanda/Bakula/rsync for backup services TCP Wrappers for hardening linux security. ext3/ext4/JFS on linux. puppet as configuration management. clonezilla. Debugging linux problems with signal trapping using bash scripts Networking : OSPF,EIGRP,RIP,BGP routing on cisco, juniper and open source in linux. Acess lists on cisco routers and security appliances (pix/asa). static and Dynamic NAT on cisco, juniper and open source linux/unix. L3 routing in cisco switches. SCCP/SIP in cisco CME, and call manager. INter vlan routing, site to site vpn, PPP/HDLC wan protocols, route summarization, equal/non equal cost load balancing. server virtualization on openvz, proxmox VE, KVM, XEN, citrix, vmware etc. desktop virtualization using citrix xendesktop and vmware view. App virtualization using citrix xenapp and vmware thinapp. user virtualization using citrix profile unity and appsense environment manager. ISCSI and Fiber channel based storage. IBM infosphere guardium for database security and data compliance CA identity minder and site minder. ...

    $11.11 /hr
    27 hours
    0.00
  6. Francesco Ongaro

    Francesco Ongaro

    Senior Security researcher

    Italy - Last active: 4 months ago - Tests: 6 - Portfolio: 1

    Francesco Ongaro is an Italian security expert and Hacker, living in Verona (the city of Romeo and Giulietta), specialized in Network and Web Application Penetration Tests. He performed several hundred of technical activities over the years for many of the most important and exposed costumers in the private, public infrastructure, finance, banking, insurance and media fields. His research and advisories are published on USH (www.ush.it) and he founded an independent Tiger Team under the ISGroup (www.isgroup.it) umbrella. Senior Security Researcher at ISGroup (http://www.isgroup.it/), IT Security Outsourcing company. CEO at USH (http://www.ush.it/), IT Security research team. IT/ICT Security - Vulnerability Assessment (VA) - Network Penetration Testing (NPT) - Social engineering - Web Application Penetration Testing (WAPT) - Ethical Hacking - Security engineering - White box Architecture, Application, Database and Code Review - IT Security Standards and Best practices Audit - IT Security Policy and Documentation Audit - Reverse Engineering - ISO 20000 / PCI DSS / NIST / COBIT - Information Risk Management - Disaster Recovery (DRP/BCP) - IT Audit & Compliance Management - Secure development - Project management

    $55.56 /hr
    1 hours
    0.00
  7. Reneesh T R

    Reneesh T R

    I am a Linux System Admin. How can I help you?

    India - Last active: 12 days ago

    I have more than six years of experience as a Linux Sever Administrator and find below the areas that I have covered. * Linux maintaince/troubleshooting (RHEL, Centos, Debian, Ubuntu), * Virtualization: (Vmware, Openvz, Virtuozzo, Xen, KVM, vserver), * Cloud hosting (Amazon EC2, AWS, S3), * Networking (dhcp, DNS:powerdns/bind/named, vpn: openvpn/pptp, firewalls: iptables/ipfw, qos, proxies), * Web servers (apache, nginx, lighttpd, tomcat), * Mail servers (exim, postfix, qmail, antispam/ antivirus: clamav/spamassassin/amavis, courier, dovecot), * Bulk marketing (Dkim, spf, high speed/inboxing, interspire), * Automation (puppet, perl/shell/awk scripting), * Monitoring (nagios, zabbix), * Hosting panels (Cpanel/WHM, Plesk, Directadmin).

    $6.00 /hr
    0 hours
    0.00
  8. Sabir Mustafa

    Sabir Mustafa

    Systems Administrator, RHCE, MCSA, Oracle Enterprise Linux Admin

    Pakistan - Last active: 1 month ago - Tests: 4

    Back in 1999, I had started from programming in Visual Basic 6, SQL Server as database and Crystal Reports for reporting purpose. I had deployed successful solutions of Inventory, cash book and sales management. Gradually I enhanced the skills and covered the System Administration in depth while deploying Windows Server 2003 based Enterprise solutions. During the deployment I gain intensive hands expertise on NTP sync, DNS, LDAP, Group Policies and Terminal Services which were further enhanced in Windows 2008. During the same deployments I came across Linux based challenges as well and deployed RedHat Enterprise Linux as the Enterprise Solution in the current organization to ensure optimum performance and security to financial data, having country wide presence on DELL and HP Servers. In order to secure the deployments I had further enhanced them by deploying Enterprise Antivirus solution.

    Groups: Red Hat Certified

    $30.00 /hr
    0 hours
    0.00
  9. Ali Asgher

    Ali Asgher

    Linux Administrator|Asterisk|Elastix|Email Deliverability Consultant

    India - Last active: 24 days ago - Portfolio: 1

    • RHCE - Red Hat Certified Engineer. • MCSA - Microsoft Certified System Administrator. • JNCP - Juniper Certified Professional. 5+ Years of Core Experience in Deploying and Maintaning Linux Servers, Core Asterisk, Elastix ,Apache and Tomcat web and application Server,LDAP, Mail Servers Qmail,Postfix, LAMP, MYSQL Databases, Squid Proxy and......Many More

    $15.00 /hr
    0 hours
    0.00