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--- eg-253:networkq:529673 [2009/11/05 12:48] – anton
+++ eg-253:networkq:529673 [2011/01/14 13:00] (current) – external edit 127.0.0.1
@@ Line 6: / Line 6: @@
 |**Name** |Anton Babentsov |
 |**Student Number** |529673 |
-|**Date of Submission** |45th Octember 3330 |
+|**Date of Submission** |10th December 2009 |
 ===== Instructions =====
@@ Line 250: / Line 250: @@
 Which system feature must be turned on if you want a Linux host to act as a router?
-**Answer**:
+IP forwarding
 ==== Question 17 ====
@@ Line 256: / Line 257: @@
 Which run-time command can be used to make a Ubuntu Linux host act as a router?
-**Answer**:
+icct@myhost:~$ sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"
 ==== Question 18 ====
@@ Line 265: / Line 267: @@
-Reproduce the contents of the file defined in [[#question_17|Question 17]] to make a Ubuntu host into a router?
+# /etc/network/options
-**Answer**
-  Copy contents of file and paste it as a listing here.
+**Answer**
-  Include a minumum indent of two spaces per line.
+# /etc/network/options - for ICCT network
-  Like this.
+# set ip_forward=yes if you need to set
+# up a machine with two network interface cards
+# as a router
+ip_forward=yes
+spoofprotect=yes
+syncookies=no
@@ Line 279: / Line 285: @@
 **Answer**:
+# Interface in icct-net does the routing,
+# so needs to know about the rest of the network.
-  Copy contents of file and paste it as a listing here.
+  auto eth0
-  Include a minumum indent of two spaces per line.
+  iface eth0 inet static
-  Like this.
+  address 192.168.1.3
+  netmask 255.255.255.0
+  gateway 192.168.1.1 # default for jupiter is solaris
+  # route to saturn-net
+  up   route add -net 192.168.3.0 netmask 255.255.255.0 gw 192.168.1.4
+  down route del -net 192.168.3.0 netmask 255.255.255.0 gw 192.168.1.4
+ # Interface in jupiter-net is much simpler
+  auto eth0
+  iface eth1 inet static
+  address 192.168.2.1
+  netmask 255.255.255.0
@@ Line 305: / Line 324: @@
 </cli>
-Add your explanation here.
+The command "netstat -r" displays  kernal routing table.
@@ Line 317: / Line 336: @@
 # Paste result here....
+Kernel Interface table
+Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
+eth0       1500 0      3615      0      0 2          3024      0      0      0 BMRU
+lo        16436 0         7      0      0 0             7      0      0      0 LRU
 </cli>
-Add your explanation here.
+The command "netstat -i" displays statistic for the network interface,
@@ Line 329: / Line 353: @@
 <cli prompt="$" comment="#">
 user@host:~$ netstat -ta
 Active Internet connections (servers and established)
 Proto Recv-Q Send-Q Local Address           Foreign Address         State
@@ Line 344: / Line 369: @@
 </cli>
-Add your explanation here.
+  Command netstat -ta displays active and passive sockets.
 ===== Testing the Connectivity of your network =====
@@ Line 356: / Line 381: @@
 **Answer**
 <cli prompt="$" comment="#">
-user@host:~$ command
+icct@callisto:~$ traceroute -n 192.168.2.2
-# paste output here
+traceroute to 192.168.2.2 (192.168.2.2), 30 hops max, 60 byte packets
+  192.168.2.2  0.082 ms  0.013 ms  0.012 ms
 </cli>
@@ Line 369: / Line 396: @@
 **Answer**
 <cli prompt="$" comment="#">
-user@host:~$ command
+icct@callisto:~$ traceroute -n www.swan.ac.uk
-# paste output here
+traceroute to www.swan.ac.uk (137.44.1.7), 30 hops max, 60 byte packets
+  192.168.2.1  0.206 ms  0.194 ms  0.151
 </cli>