Let me document some basic TCP/IP stuffs for OS/2 Warp 4.5 in the form of FAQ as a memo to myself. I seem to forget these easily as OS/2 is not my primary operating system. The information contained in this page is purely based on my experience and I don't guarantee correctness and/or completeness.
Q. What is the simplest way to configure TCP/IP? A. Open TCP/IP Configuration Notebook from WPS or by executing tcpcfg2 from the command line. Q. Can I configure it from the command-line? A. Yes, OS/2 provides common networking utilities like ifconfig. See examples below.
You can find more networking utilities in C:\MPTN\BIN. You can get help on them by executing tcphelp. Q. What file initializes a NIC with an IP address upon start-up? A. C:\MPTN\BIN\SETUP.CMD. The TCP/IP Configuration Notebook can overwrite this file as necessary. The file shows the following contents when I enable DHCP on the first LAN interface. [C:\]type \mptn\bin\setup.cmd route -fh arp -f ifconfig lo 127.0.0.1 REM ifconfig lan0 nil REM ifconfig lan1 nil metric 1 mtu 1500 REM ifconfig lan2 metric 1 mtu 1500 REM ifconfig lan3 metric 1 mtu 1500 REM ifconfig lan4 metric 1 mtu 1500 REM ifconfig lan5 metric 1 mtu 1500 REM ifconfig lan6 metric 1 mtu 1500 REM ifconfig lan7 metric 1 mtu 1500 dhcpstrt -i lan0 REM ifconfig sl0 ipgate off When I switches to a static IP address of 192.168.2.21 with the default gateway of 192.168.2.1, it shows the following. [C:\]type \mptn\bin\setup.cmd route -fh arp -f ifconfig lo 127.0.0.1 ifconfig lan0 192.168.2.21 netmask 255.255.255.0 metric 1 mtu 1500 REM ifconfig lan1 nil metric 1 mtu 1500 REM ifconfig lan2 metric 1 mtu 1500 REM ifconfig lan3 metric 1 mtu 1500 REM ifconfig lan4 metric 1 mtu 1500 REM ifconfig lan5 metric 1 mtu 1500 REM ifconfig lan6 metric 1 mtu 1500 REM ifconfig lan7 metric 1 mtu 1500 REM ifconfig sl0 route add default 192.168.2.1 - hopcount ipgate off Q. How can I change my host name? A. You can set the host name by setting HOSTNAME in config.sys. [C:\]find "HOSTNAME" c:\config.sys Alternatively, you can open TCP/IP Configuration Notebook and enter the host name in the Host Names tab as shown below. Note:
Q. What is the counterpart for /etc/resolve.conf in *nix?
A. %ETC%\RESOLV2
[C:\]type %ETC%\RESOLV2 domain abiyo.net nameserver 8.8.8.8 nameserver 8.8.8.4 You may use TCP/IP Configuration Notebook to change the contents of this file instead of modifying it directory. Q. Where can I find the simple host name lookup information like /etc/hosts in *nix? A. %ETC%\HOSTS [C:\]type %ETC%\hosts 127.0.0.1 localhost You may use TCP/IP Configuration Notebook to manipulate the host names in this file. Q. How can I make a TCP/IP program resolve a host name via the host file before having contacted a domain name server?
A. You can change the default behavior of contacting a domain name server by setting the environment variable USE_HOSTS_FIRST. Setting this environment variable regardless of its value makes a properly written TCP/IP program resolve a host name via the host file first, then try a domain name server.
Let's assume the following sample host file.
[C:\]type %ETC%\hosts 127.0.0.1 localhost 192.168.1.3 www.yahoo.com Make sure that USE_HOSTS_FIRST is not set.
[C:\]set USE_HOSTS_FIRST= [C:\]set USE_HOSTS_FIRST USE_HOSTS_FIRST=(null) Pinging to www.yahoo.com sends ICMP packets to the IP address resolved via a domain name server. [C:\]nslookup www.yahoo.com Server: google-public-dns-a.google.com Address: 8.8.8.8 Non-authoritative answer: Name: any-fp.wa1.b.yahoo.com Addresses: 72.30.2.43, 98.137.149.56 Aliases: www.yahoo.com, fp.wg1.b.yahoo.com [C:\]ping www.yahoo.com PING any-fp.wa1.b.yahoo.com: 56 data bytes 64 bytes from 72.30.2.43: icmp_seq=0. time=110. ms 64 bytes from 72.30.2.43: icmp_seq=1. time=110. ms ----any-fp.wa1.b.yahoo.com PING Statistics---- 2 packets transmitted, 2 packets received, 0% packet loss round-trip (ms) min/avg/max = 110/110/110 The behavior changes after having set USE_HOSTS_FIRST. The ping program sends ICMP packets to 192.168.1.3 instead. [C:\]set USE_HOSTS_FIRST=1 [C:\]set USE_HOSTS_FIRST USE_HOSTS_FIRST=1 [C:\]ping www.yahoo.com PING www.yahoo.com: 56 data bytes 64 bytes from 192.168.1.3: icmp_seq=0. time=10. ms 64 bytes from 192.168.1.3: icmp_seq=1. time=0. ms ----www.yahoo.com PING Statistics---- 2 packets transmitted, 2 packets received, 0% packet loss round-trip (ms) min/avg/max = 0/5/10 You can add the environment variable to CONFIG.SYS to make the new behavior permanent. [C:\]find "USE_HOSTS_FIRST" c:\config.sys ---------- c:\config.sys SET USE_HOSTS_FIRST=yes If you don't like to change config.sys manually, you can open TCP/IP Configuration Notebook and check Look through Hosts list before going to Name Server. |
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