Differences for page IPCurrent version compared with version Sun May 16 11:54:53 GMT 2004- The basic network transmission protocol of the Internet and every network based on [TCP/IP].+ The basic network transmission protocol of the Internet and every network based on [TCP/IP].
+
+ This is the [C] structure that represents an [IP] header (version 4):
+
+ struct iphdr {
+ #if defined(__LITTLE_ENDIAN_BITFIELD)
+ __u8 ihl:4,
+ version:4;
+ #elif defined (__BIG_ENDIAN_BITFIELD)
+ __u8 version:4,
+ ihl:4;
+ #else
+ #error "Please fix <asm/byteorder.h>"
+ #endif
+ __u8 tos;
+ __u16 tot_len;
+ __u16 id;
+ __u16 frag_off;
+ __u8 ttl;
+ __u8 protocol;
+ __u16 check;
+ __u32 saddr;
+ __u32 daddr;
+ /*The options start here. */
+ };
+
+ The [IP] protocol is the part of [TCP/IP] that allows packets of data to pass from one host to another.
+ It's possible to think at an IP packet as a piece of data with a source and destination address attached,
+ at every point of it's trip the destination address is used to select the right way in order to
+ reach the destination host.
+
+
+ In a [TCP/IP] network, hosts are identified by IP addresses. An [IP address] in the IPv4 protocol is a 4 byte number,
+ usually represented as four 8-bit numbers separated by a point (example: 192.168.1.6).
+
+
+ The [IP] protocol works in a *best effort* fashion. This means that there is no guarantee that packets will eventually
+ reach the destionation. They may be lost, duplicated, out of sequence. Higher level protocols like [TCP] add the reliability
+ abstraction using the [IP] protocol as a base.
+
+
+ A protocol strictly related to the [IP] protocol is the [ICMP].
+
+
+ See Also: [IPID] and [Idle scan]. The following is the old page content
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