Chapter 1 Linux Network Infrastructure
This chapter gives the computer system
information, network configuration.
1.1 Computer
System Information
Table
1.1 shows the CPU, memory, OS information of the computers that are used in the
project. This information is from /proc/cpuinfo, /proc/meminfo, uname -a
|
Machine
|
CPU
Information
|
Memory
Info
|
OS
Info
|
|
Dublin.cs.unh.edu
|
Pentium
III (728.455MHz)
|
Mem:256MB
Swap:1GB
|
Red
Hat Linux 7.0 kernel2.4.10
|
|
Madrid.cs.unh.edu
|
Pentium
III (728.448MHz)
|
Mem:512MB
Swap:
1GB
|
Red
Hat Linux 7.0 kernel2.2.16
|
|
Prague.cs.unh.edu
|
Pentium
III (728.458MHz)
|
Mem:256MB
Swap:1GB
|
Red
Hat Linux 7.0 kernel2.2.16
|
Table 1.1 Computers used in this project.
1.2 Network
Configuration Information
Table
1.2 shows the Network interfaces setting in the project. This information is
got from the result of command ifconfig and /sbin/lsmod. The basic diagram
is shown at Figure 1.1.
|
Machine
|
Interface
|
Chip
|
IP
address
|
Mac
Address
|
|
Dublin.cs.unh.edu
|
100Mb/s Eth0
|
3Com
3c90x
|
132.177.8.28/25
|
00:B0:D0:FE:D8:09
|
|
100Mb/s Eth1
|
Tulip
|
192.168.2.1/24
|
00:C0:F0:6A:56:51
|
|
100Mb/s Eth2
|
Tulip
|
192.168.1.1/24
|
00:C0:F0:6A:6D:0C
|
|
Madrid.cs.unh.edu
|
100Mb/s Eth0
|
3Com
3c90x
|
132.177.8.27/25
|
00:B0:D0:D8:FD:EA
|
|
100Mb/s Eth1
|
Tulip
|
192.168.1.2/24
|
00:C0:F0:6A:74:F1
|
|
100Mb/s Eth2
|
Tulip
|
192.168.3.1/24
|
00:C0:F0:6A:74:ED
|
|
Prague.cs.unh.edu
|
100Mb/s Eth0
|
3Com
3c90x
|
132.177.8.29/25
|
00:B0:D0:D8:FE:91
|
|
100Mb/s Eth1
|
Tulip
|
192.168.2.2/24
|
00:C0:F0:6A:6D:4E
|
|
100Mb/s Eth2
|
Tulip
|
192.168.3.2/24
|
00:C0:F0:6A:75:10
|
Table 1.2 Network interfaces settings.
1.2.1 Basic
Diagram
------------------
| switch |
| |
| 10 9 11 |
------------------
| | |
| | |
| | | 132.177.8.0/25
------------------- | -------------------
| | |
| | |
| | |
| | |
----------------- ------------------- ---------------------
| eth0 | | eth0 | | eth0 |
| | | | | |
| Madrid | | Dublin | | Prague |
| | | | | |
| eth2 eth1 | | eth2 eth1 | | eth1 eth2 |
----------------- ------------------- ---------------------
3.1| |1.2 1.1| |2.1 2.2 | | 3.2
| ---------------- ---------------- |
| 192.168.1.0/24 192.168.2.0/24 |
| |
-----------------------------------------------------
192.168.3.0/24
Figure 1.1 Infrastructure diagram.
Experiments in this chapter refer to this route:
Madrid:eth1 ==> Dublin:eth2 ==> Dublin:eth1 ==> Prague:eth1
Dublin
is used as router.
1.2.2 Static
Route Setting:
Now
we show the route setting in these machines. We get this information by command
route.
·
Madrid.cs.unh.edu
Destination
Gateway Genmask Flags Metric Ref Use Iface
132.177.8.0 * 255.255.255.128 U 0 0 0 eth0
192.168.3.0 * 255.255.255.0
U 0 0 0 eth2
192.168.2.0
192.168.1.1 255.255.255.0
UG 0 0 0 eth1
192.168.1.0 * 255.255.255.0
U 0 0 0 eth1
127.0.0.0 * 255.0.0.0
U 0 0 0 lo
default phub0.cs.unh.edu 0.0.0.0 UG 0 0 0 eth0
·
Dublin.cs.unh.edu
Destination
Gateway Genmask Flags Metric Ref Use Iface
132.177.8.0
* 255.255.255.128 U
0 0 0 eth0
192.168.3.0
192.168.2.2 255.255.255.0 UG 0 0 0 eth1
192.168.2.0
* 255.255.255.0 U 0 0 0 eth1
192.168.1.0
* 255.255.255.0 U 0
0 0 eth2
127.0.0.0 *
255.0.0.0 U
0 0 0 lo
default
phub0.cs.unh.edu 0.0.0.0
UG 0 0 0 eth0
·
Prague.cs.unh.edu
Destination
Gateway Genmask Flags Metric Ref Use Iface
132.177.8.0 * 255.255.255.128
U
0 0 0 eth0
192.168.3.0 * 255.255.255.0 U 0
0 0 eth2
192.168.2.0 * 255.255.255.0 U 0 0 0 eth1
192.168.1.0
192.168.2.1
255.255.255.0 UG 0
0 0 eth1
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default phub0.cs.unh.edu 0.0.0.0 UG 0
0 0 eth0
1.2.3 TCP parameters on the machines we are using
Table
1.3 shows the TCP information of Dublin.cs.unh.edu (kernel 2.4.10). Table 1.4
shows the TCP information of Madrid
and Prague (kernel 2.2.16). We get
this table from proc file system. /proc/sys/net/ipv4/tcp*
|
tcp_max_tw_buckets 180000
|
tcp_ecn
1
|
|
tcp_mem 48128 48640
49152
|
tcp_syn_retries 5
|
|
tcp_orphan_retries 0
|
tcp_fack
1
|
|
tcp_reordering 3
|
tcp_synack_retries 5
|
|
tcp_retrans_collapse 1
|
tcp_fin_timeout
60
|
|
tcp_retries1 3
|
tcp_syncookies 0
|
|
tcp_retries2 15
|
tcp_keepalive_intvl
75
|
|
tcp_abort_on_overflow 0
|
tcp_timestamps 1
|
|
tcp_rfc1337 0
|
tcp_keepalive_probes
9
|
|
tcp_adv_win_scale
2
|
tcp_tw_recycle 0
|
|
tcp_rmem 4096 87380
174760
|
tcp_keepalive_time
7200
|
|
tcp_app_win
31
|
tcp_window_scaling 1
|
|
tcp_sack 1
|
tcp_max_orphans
8192
|
|
tcp_dsack
1
|
tcp_wmem 4096 16384
131072
|
|
tcp_stdurg 0
|
tcp_max_syn_backlog 1024
|
Table 1.3 Dublin TCP
version information
|
tcp_max_tw_buckets N/A
|
tcp_ecn
N/A
|
|
tcp_mem N/A
|
tcp_syn_retries 10
|
|
tcp_orphan_retries N/A
|
tcp_fack
N/A
|
|
tcp_reordering N/A
|
tcp_synack_retries 5
|
|
tcp_retrans_collapse 1
|
tcp_fin_timeout
180
|
|
tcp_retries1 7
|
tcp_syncookies 0
|
|
tcp_retries2 15
|
tcp_keepalive_intvl
N/A
|
|
tcp_abort_on_overflow N/A
|
tcp_timestamps 1
|
|
tcp_rfc1337 0
|
tcp_keepalive_probes
9
|
|
tcp_adv_win_scale
N/A
|
tcp_tw_recycle N/A
|
|
tcp_rmem N/A
|
tcp_keepalive_time
7200
|
|
tcp_app_win
N/A
|
tcp_window_scaling 1
|
|
tcp_sack 1
|
tcp_max_orphans
N/A
|
|
tcp_dsack
N/A
|
tcp_wmem N/A
|
|
tcp_max_ka_probes 5
|
|
tcp_stdurg 0
|
tcp_max_syn_backlog 128
|
Table 1.4 TCP version
information on Madrid and Prague