postIt » network

Tunnel remote port 8383 to become availa …

Arif — Tue, 28 Nov 2023 03:48:26 +0000

Tunnel remote port 8383 to become available as localhost:5433

ssh -L 5433:localhost:8383 some-user@some-server

Change internet default route in Mac OS …

Arif — Thu, 11 Apr 2013 03:29:58 +0000

Change internet default route in Mac OS X to USB HSDPA modem stick with LAN’ certain subnet routed via a gateway in WiFi (en1).

In my case DNS will go with the modem interface setting remain routed via USB modem stick

before routing:

$ netstat -nr
 
Routing tables
 
Internet:
Destination        Gateway            Flags        Refs      Use   Netif Expire
default            10.64.64.64        UGSc           72      137    ppp0
default            link#4             UCSI            0        0     en0
default            10.1.1.1          UGScI           0        0     en1

Delete and add routes (desired LAN subnet 192.168.1.0/24:

sudo route -n delete default 10.1.1.1
sudo route -n add default 10.64.64.64
sudo route -n add 192.168.1.0/24 10.1.1.1

after routing:

$ netstat -nr
 
Routing tables
 
Internet:
Destination        Gateway            Flags        Refs      Use   Netif Expire
default            10.64.64.64        UGSc           21        0    ppp0
default            link#4             UCSI            0        0     en0
default            10.1.1.1          UGScI           0        0     en1
10.1.1/24         link#5             UCS             6        0     en1
...
192.168.1         10.1.1.1          UGSc            0        0     en1
...

Socket monitoring by watching receive an …

Arif — Wed, 10 Aug 2011 08:03:50 +0000

Socket monitoring by watching receive and send queue every 5 seconds

$ while true; do netstat -tn; sleep 5; clear; done

Result:

 
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 10.238.133.152:43941    98.136.48.103:5050      ESTABLISHED
tcp        1      0 10.238.133.152:42541    8.27.254.249:80         CLOSE_WAIT
tcp        1      0 10.238.133.152:34355    184.73.222.16:80        CLOSE_WAIT
tcp        0      0 10.238.133.152:43210    199.59.148.87:443       ESTABLISHED
tcp        0    229 10.238.133.152:43209    199.59.148.87:443       ESTABLISHED

This is to emulate combination of watch and ss in Solaris, more or less same result

$ watch -n 5 ss -t

State      Recv-Q Send-Q      Local Address:Port          Peer Address:Port
ESTAB      0      0          10.238.133.152:36045       74.125.224.250:https
ESTAB      0      0          10.238.133.152:36044       74.125.224.250:https
CLOSE-WAIT 1      0          10.238.133.152:59622      174.129.233.179:www
ESTAB      0      0          10.238.133.152:43941        98.136.48.103:mmcc
CLOSE-WAIT 38     0          10.238.133.152:49300        199.59.148.87:https
ESTAB      0      0          10.238.133.152:33626       74.125.224.191:https
CLOSE-WAIT 1      0          10.238.133.152:37621        208.46.163.81:www

Check route/gateway in Solaris # nets …

Arif — Wed, 06 Oct 2010 05:06:18 +0000

Check route/gateway in Solaris

# netstat -rn
 
Routing Table: IPv4
  Destination           Gateway           Flags  Ref     Use     Interface
-------------------- -------------------- ----- ----- ---------- ---------
default              192.168.40.1         UG        1          0
192.168.40.0         192.168.40.91        U         1          2 e1000g2
224.0.0.0            192.168.40.91        U         1          0 e1000g2
127.0.0.1            127.0.0.1            UH        1          0 lo0

If no /etc/defaultrouter set (file not exist), booting will set no default gateway as

# netstat -rn
 
Routing Table: IPv4
  Destination           Gateway           Flags  Ref     Use     Interface
-------------------- -------------------- ----- ----- ---------- ---------
192.168.40.0         192.168.40.91        U         1          2 e1000g2
224.0.0.0            192.168.40.91        U         1          0 e1000g2
127.0.0.1            127.0.0.1            UH        1          0 lo0

Single permanent IP (up on boot) on one …

Arif — Wed, 02 Jun 2010 04:47:44 +0000

Single permanent IP (up on boot) on one interface:
/etc/inet/hosts content:
# # Internet host table # ::1 localhost 127.0.0.1 localhost 192.168.40.91 cxnode01 .cxnode01 loghost 192.168.40.92 cxnode02

The interface where you want to bind the above ip: /etc/hostname.e1000g2 containing
cxnode01

Change hostname etc. /etc/hosts /e …

Arif — Sun, 11 Apr 2010 13:13:17 +0000

Change hostname etc.

/etc/hosts /etc/nodenames /etc/hostname.[device] /etc/defaultrouter /etc/defaultdomain /etc/nodename