[SOLVED] ping only goes one way

[clariceoshea]

thanks, very informative

[clariceoshea]

how does one enable routing???

[jpollard]

Are you talking about forwarding packets from one interface to another?

[clariceoshea]

the same problem all over again after I disconnected the original

two computers on the same USR 8003 broadband router
one cannot ping the other

[stevea]

In post #6 you have ....

[landon@Precision-380 etc]$ ifconfig
...
p4p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.123.100 netmask 255.255.255.0 broadcast 192.168.123.255
...

[landon@Precision-380 etc]$ cat /etc/hosts.............did this last week..didn't work
192.168.123.101 Precision-380

As JPollard said you have to get all the sources to agree.
The 192.168.x.x addresses are private LAN ips and not assigned byt the ISP.
For some reason your system called 'Precision-380' is actually assigned address 192.168.123.100
but your /etc/hots files claims its, 192.168.123.101 .

[clariceoshea]

[root@Precision-380 etc]# cat hosts
192.168.122.1 landon-PC
192.168.123.100 Precision-380
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6


these match the values from ifconfig

[root@Precision-380 etc]# ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 16436
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 115 bytes 65949 (64.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 115 bytes 65949 (64.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

p4p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.123.100 netmask 255.255.255.0 broadcast 192.168.123.255
inet6 fe80::213:72ff:fe21:cf41 prefixlen 64 scopeid 0x20<link>
ether 00:13:72:21:cf:41 txqueuelen 1000 (Ethernet)
RX packets 23417 bytes 17231740 (16.4 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 24090 bytes 13081076 (12.4 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 17

[clariceoshea]

from US Robotics who made the broadband router

> Thanks for the details. What you would like to do is unfortunately out of the capabilities of this router, since this unit can only have 1 WAN IP address at a time. Even if the 2 computers have different IP addresses range within the same network, the Internet IP address (WAN IP address) would still be the same for both computer. For this you would need a router that is capable of having 2 WAN IP address at a time.

[jpollard]

Originally Posted by clariceoshea

from US Robotics who made the broadband router

> Thanks for the details. What you would like to do is unfortunately out of the capabilities of this router, since this unit can only have 1 WAN IP address at a time. Even if the 2 computers have different IP addresses range within the same network, the Internet IP address (WAN IP address) would still be the same for both computer. For this you would need a router that is capable of having 2 WAN IP address at a time.

I think your terminology is a bit off. All it requires is that the "router" not be a bridge.

What is existing is a NAT router that is attached to a bridge. The NAT router can only NAT one network.

Even so, it is still possible to do IF a system acts as a forwarding router. That system is then acting as a general purpose router.

[stevea]

Originally Posted by clariceoshea

[root@Precision-380 etc]# cat hosts
192.168.122.1 landon-PC
192.168.123.100 Precision-380
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6


these match the values from ifconfig

[root@Precision-380 etc]# ifconfig
...
p4p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.123.100 netmask 255.255.255.0 broadcast 192.168.123.255
...

Ahem -
A/ Stop using deprecated tools. Get IP addresses including secondaries w/ "ip addr".
B/ The above DOES NOT match your post #6. So should I assume you lying in post #6 or that are you lying now ?? Something changed since post#6 and you aren't revealing it. Think I'll find a poster who isn't trying to deceive and obfuscate - best wishes.

[hmmsjan]

[root@Precision-380 etc]# cat hosts
192.168.122.1 landon-PC
192.168.123.100 Precision-380
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

Is this correct? A system with address 192.168.122.x cannot communicate with a system with
address 192.168.123.x given the standard 255.255.255.0 netmask.
All systems including the router should have a 192.168.123.x address.


Good luck.

[clariceoshea]

believe the problem is solved

bought a Linksys E1200 router

http://192.168.1.104:8080/log_book_MySQLnew_i.php


http://192.168.1.102:8080/log_book_MySQLnew_i.php

username landon

password Kateaux3141

go ahead delete/alter/create some rows

I can restore in seconds

as with all RDB date formats are a challenge so copy/alter/paste dates

uses Server version: 5.5.27 MySQL Community Server (GPL)

Apache 2.2.22

Oracle and ms sql server versions also exist

the MS SQL server version is a mass of random admin

Oracle install is full of special admin for Linux

nore than 10 Oracle/linux installs to my credit

why? I didn't use the Oracle install instructions

the PHP code for this log_book app is easily altered to

membership apps

[clariceoshea]

what is the difference between a router and a switch

some routers do everythingAll I wanted was to connect 2 computers to stand on their own

coming off the ethernet cable modem

One more question:

I've seen comments that say that the host or hosts file is obsolete?

If I put a static IP in the hosts file, the cable company will change IPs

using DHCP

[jpollard]

They both do the same function, but they do it in different ways.

The router is basic, it receives a packet (the entire thing) and then sends the packet on after address modification to forward to the destination.

A switch does the the same thing - the difference is that the switch attempts to do the routing function before the rest of the data packet arrives from the sender, then it connects the signals from input through a custom handler that recomputes the checksums on the fly. This is done to provide faster response - there is no buffering of the data in the packet.

[clariceoshea]

thanks ! new router seems to have made the difference

believe it or not, I got the Linksys router E1200 at Walmart

[hmmsjan]

Dear clariceoshea,

You need a switch. This device can be used to connect a number of computers to a network. The ethernet packets are not modified, but because the switch evaluates the MAC addresses in the packets, only the PC's having this MAC address receive the packets. Each PC get's only the traffic via the cable where it's interested in.

A router connects two or more networks, e.g. your private LAN and the internet providers network. I can do modification of the packets, e.g. network address translation, firewalling, logging, traffic shaping and so on.
An internet provider connects his network via big routers to other providers or network nodes.

Hope that this helps you.