Networking in Software

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Networking
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The TCP statistics are more mixed: there were 324 tcpAttemptFails, but given that there were 33,786 tcpActiveOpens at the time netstat was run, this is quite reasonable. The ratio of tcpInInorderSegs to tcpInUnorderSegs (i.e., received in order vs. not received in order) was 229:1, which is not uncommon.
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IP ipForwarding ipInReceives ipInAddrErrors ipForwDatagrams ipInUnknownProtos ipInDelivers ipOutDiscards ipReasmTimeout ipReasmOKs ipReasmDuplicates ipFragOKs ipFragCreates tcpInErrs udpInCksumErrs rawipInOverflows = 2 =16081438 = 0 = 0 = 274 =16146712 = 0 = 60 = 0 = 0 = 7780 = 40837 = 291 = 2 = 0 ipDefaultTTL ipInHdrErrors ipInCksumErrs ipForwProhibits ipInDiscards ipOutRequests ipOutNoRoutes ipReasmReqds ipReasmFails ipReasmPartDups ipFragFails ipRoutingDiscards udpNoPorts udpInOverflows = 255 = 8 = 1 = 2 = 0 =19560145 = 0 = 0 = 0 = 0 = 0 = 0 =144065 = 0
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There are some IP errors but they were quite minor: there were eight ipInHdrErrors but only one ipInCksumErrs, and two udpInCksumErrs.
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ICMP icmpInMsgs = 17469 icmpInCksumErrs = 0 icmpInDestUnreachs = 2343 icmpInParmProbs = 0 icmpInRedirects = 19 icmpInEchos = 9580 icmpInTimestamps = 0 icmpInAddrMasks = 0 icmpInFragNeeded = 0 icmpOutDrops =140883 icmpOutDestUnreachs = 2113 icmpOutParmProbs = 0 icmpOutRedirects = 0 icmpOutEchoReps = 9580 icmpOutTimestampReps= 0 icmpOutAddrMaskReps = 0 icmpInOverflows = 0 icmpInErrors icmpInUnknowns icmpInTimeExcds icmpInSrcQuenchs icmpInBadRedirects icmpInEchoReps icmpInTimestampReps icmpInAddrMaskReps icmpOutMsgs icmpOutErrors icmpOutTimeExcds icmpOutSrcQuenchs icmpOutEchos icmpOutTimestamps icmpOutAddrMasks icmpOutFragNeeded = 0 = 0 = 26 = 0 = 19 = 5226 = 0 = 0 = 11693 = 0 = 0 = 0 = 0 = 0 = 0 = 0
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On the ICMP front, icmpOutErrors and icmpInErrors are both 0, although there were 2,113 icmpOutDestUnreachs, indicating that at some point a network connection was not able to made when requested. This can be checked with the traceroute utility. Running a cron job to extract these figures to a file and then writing a PERL script to compare the values of concern is also often useful, because it is possible that errors could be masked by integers being wrapped around and starting at zero, after they reach values that are greater than the maximum available for a machine s architecture. However, this should not be a problem for the 64-bit Solaris kernel.
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In this chapter, you have learned about static and dynamic routing systems and how to configure two basic firewall systems. These systems are complex, and before implementing either one you should review each product s documentation.
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Remote Access
he service access facility (SAF) is a port management system that manages requests and responses for access to system ports. In this case, a port is defined as the physical connection between a peripheral device and the system. For example, most systems have one or more serial ports that allow for sequential data transmission effectively down a single line. In contrast, a parallel port allows for several lines of data to be transmitted bidirectionally. The SAF system is designed to allow requests to be made to the system from peripheral devices through ports, and to ensure that these requests are appropriately serviced by the relevant port monitor. Modems, which allow Solaris 10 systems to connect to the Internet over a phone line, require SAF to operate through system serial ports. Thus, it s important to understand how to configure ports, port monitors, and listeners in preparation for making an Internet connection using a modem. Note that most Solaris systems are never accessed through a modem; however, if a system s only network card has died, and the console is physically inaccessible, a modem can be a lifesaver. The Point-to-Point Protocol (PPP) daemon (pppd) is commonly used to set up modem access to an Internet service provider (ISP). PPP supports TCP/IP, and provides the Challenge Handshake Authentication Protocol (CHAP), which provides a higher level of security than is usually found on modem links. The PPP daemon relies on the chat program to perform dial-up and handle connections. In this chapter, we examine how to set up PPP for Internet connections.
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