Multiple Snort_inline processes with Vuurmuur

One of the cool things of the Snort_inline project is the support for NFQUEUE. NFQUEUE is the new queuing mechanism to push packets from the kernel to userspace so a userspace program can issue a verdict on it. What makes NFQUEUE cooler than it’s predecessor ip_queue is that it supports multiple queue’s. This means that there can be more than one Snort_inline process inspecting and judging traffic. The challenge is to make sure that each Snort_inline instance sees all traffic belonging to a certain connection so Snort_inline can do stateful inspection on it. Luckily, Vuurmuur makes it very easy.