December 2005
Intermediate to advanced
1066 pages
33h 38m
English
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Acting As a Proxy
The section "Proxying the Neighboring Protocol" in Chapter 26 described why proxies are useful and gave a few examples of their use. It also showed the criteria by which neighboring protocols decide whether a given solicitation request is taken care of by the proxy. This section goes into detail on the implementation of proxying .
We saw in the section "Conditions Required by the Proxy" in Chapter 26 that two kinds of proxying can be configured: a host either can proxy all requests received on a particular NIC (per-device proxying) or, more selectively, can proxy requests for a particular address received on a particular NIC (per-destination proxying).
The precedence shown in Figure 26-8
in Chapter 26 is enforced in protocol-specific
code. ARP's implementation is shown in Chapter
28, and you can look at the routine neigh_recv_ns for IPv6's implementation. The section "Per-Device Proxying and Per-Destination
Proxying" also goes into more detail about these two types of proxying.
Before digging into the code, let me introduce a naming convention used extensively
there. The neighboring subsystem contains pairs of functions and data structures whose
names differ only in the presence or absence of an initial p (e.g., neigh_lookup versus pneigh_lookup). The p stands for
proxy. Because addresses intercepted by proxies are handled
differently, there is a dedicated set of functions to manipulate them.
Delayed Processing of Solicitation Requests
Solicitation requests handled ...
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