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Policy Rules interface
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Part V:
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Networking
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SunScreen performs more than just packet filtering it can be used to set up a virtual private network (VPN), and can perform advanced network address translation (NAT) functions. Further discussion of these concepts is beyond the scope of this book.
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The following examples show how to work with a router.
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Viewing Router Status
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For both routing and multihomed hosts, the status of all network interfaces can be checked by using the netstat -i command:
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router# netstat -i Name Mtu Net/Dest Address Ipkts Ierrs Opkts Oerrs Collis Queue lo0 8232 loopback localhost 199875 0 199875 0 0 0 hme0 1500 204.17.65.0 subsidiary.com 16970779 623190 19543549 0 0 0 hme1 1500 10.17.65.0 internal.gov 68674644 54543 65673376 0 0 0
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In this example, mtu is the maximum transfer rate, which is much higher for the loopback address than for the network interface (as would be expected), and the number of Ipkts (inbound packets) and Opkts (outbound packets) is equivalent for lo0 (as one would hope). The loopback interface significantly increases the efficiency of a host that transmits packets to itself: in this example, there is an almost sixfold increase in the mtu for the lo0 interface over either of the standard network interfaces. The primary network interface hme0 is connected to the 204.17.65.0 network, and has transmitted a large number of packets in and out since booting (16970779 and 19543549, respectively). There have been a number of inbound errors (623190), but no outbound errors or collisions. Examining how the number of inbound and outbound errors change over time may indicate potential problems in network topology that need to be addressed. For example, if you are testing a Web server and it doesn t appear to be working, the Ipkts count can reveal whether or not the connections are actually being made: if the counter does not increase as expected, an intermediate hardware failure may be indicated (e.g., a dead switch). Another example of a situation in which you might identify intermittent hardware failure is if you discover a large number of inbound packets, representing requests, but only a small number of outbound packets. In the following example, there are 1000847 inbound packets but only 30159 outbound packets since boot. Since it is unlikely in most situations that a 33:1 imbalance exists in the ratio of inbound to outbound packets, you would check the hme0 network interface. There are also many collisions being experienced by the hme0 interface: collisions between packets render them useless, and the figure reported here indicates a significant loss of bandwidth. If the interface is working as expected, it can also be worthwhile to investigate other causes arising from software (e.g., incorrect configuration of a packet filter).
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23:
Routing and Firewalls
server# netstat -i Name Mtu Net/Dest lo0 8232 loopback hme0 1500 204.17.64.0
Address localhost 1000847 5
Ipkts Ierrs Opkts Oerrs Collis Queue 7513 0 7513 0 0 0 30159 0 3979 0
netstat -s also allows these per-interface statistics to be viewed on a per-protocol basis, which can be very useful in determining potential problems with routing, especially if the router is packet filtering. The following example shows output from the netstat -s command, which displays the per-protocol statistics for the UDP, TCP, and ICMP protocols:
router# netstat -s UDP udpInDatagrams udpOutDatagrams
=502856 =459357
udpInErrors
The following output from netstat s begins with the UDP statistics, including the number of datagrams received and the number transmitted. The In/Out ratio is fairly even at 1.09, and the networking appears to be working well: there were no detected UDP errors (i.e., udpInErrors=0).
TCP tcpRtoAlgorithm = 4 tcpRtoMax =240000 tcpActiveOpens = 33786 tcpAttemptFails = 324 tcpCurrEstab = 384 tcpOutDataSegs =13666668 tcpRetransSegs = 33038 tcpOutAck =5490764 tcpOutUrg = 51 tcpOutWinProbe = 290 tcpOutRsts = 1455 tcpInSegs =15617893 tcpInAckSegs =9161810 tcpInDupAck =4559921 tcpInInorderSegs =5741788 tcpInUnorderSegs = 25045 tcpInDupSegs =4390218 tcpInPartDupSegs = 375 tcpInPastWinSegs = 17 tcpInWinProbe = 162 tcpInClosed = 313 tcpRttUpdate =9096791 tcpTimRetransDrop = 26 tcpTimKeepaliveProbe= 76 tcpListenDrop = 0 tcpHalfOpenDrop = 0 tcpRtoMin tcpMaxConn tcpPassiveOpens tcpEstabResets tcpOutSegs tcpOutDataBytes tcpRetransBytes tcpOutAckDelayed tcpOutWinUpdate tcpOutControl tcpOutFastRetrans tcpInAckBytes tcpInAckUnsent tcpInInorderBytes tcpInUnorderBytes tcpInDupBytes tcpInPartDupBytes tcpInPastWinBytes tcpInWinUpdate tcpRttNoUpdate tcpTimRetrans tcpTimKeepalive tcpTimKeepaliveDrop tcpListenDropQ0 = 200 = -1 = 12296 = 909 =19158723 =981537148 =41629885 =462511 = 456 = 92218 = 18954 =981315052 = 0 =1120389303 =16972517 =4889714 =130424 =1808990872 = 270 = 28077 = 18098 = 509 = 1 = 0
Part V:
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