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Finding Malware Persistence in Linux: How a Cron Job Kept Reinfecting Our Zimbra Server
Killing a malicious process does not necessarily remove malware from a Linux server. We learned this…
Read MoreFinding Malware Persistence in Linux: How a Cron Job Kept Reinfecting Our Zimbra Server
Keeping DNS Answers Fast While Updating Routing Policy
DNS steering systems change over time. Operators add new endpoints. Health state changes. A new region…
Building A Runtime Snapshot For Fast Authoritative DNS Decisions
Authoritative DNS must answer quickly. When a recursive resolver asks for a DNS record, the authoritative…
Health Checks In DNS Steering: From Origin Status To Answer Policy
DNS steering should not return an endpoint only because it is nearby. It should not return…
Designing Fallback Logic For Reliable DNS Steering
DNS steering is useful when the system has enough information to choose a good answer. But…
Centralized Authentication and Home Directories with UCS, LDAP, and NFS
In Part 2, we built the LTSP server for PXE boot thin clients on Ubuntu 24.04.…
EDNS Client Subnet: Powerful Signal Or Operational Trap?
DNS steering depends on signals. The better the signal, the better the routing decision can be.…
Building the LTSP Server for PXE Boot Thin Clients on Ubuntu 24.04
Building the LTSP Server for PXE Boot Thin Clients on Ubuntu 24.04 In Part 1, we…
Inside Requester Classification: IP, ASN, Country, And Resolver Signals
DNS steering depends on one basic question: Who is asking? The answer is not always simple.…
