AlexJ's Computer Science Journal

Monthly Archives: December 2011

[TechBlog] Stack Allocation

[Originally posted on] Stack space is the part of each process’ virtual memory where function arguments and return addresses are stored, along with local variables declared within a function. Usually, the stack begins at the high address space of the virtual memory and grows down. At every function call, a new stack frame is […]

[CCIELab] Output manipulation in Cisco IOS

[Originally posted on] Unlike Linux’s iptables, Cisco’s filtering via Access Control Lists sometimes has hidden behavior. Let us test how ACL filtering works using the following topology. We assume that we have Layer 3 connectivity via static routes. We will apply ACLs on the outbound direction of F1/0 on R2 (we want it to […]