Please help me about routing

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Please help me about routing

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Please help me about routing
Please help me about routing
2023-03-30 08:08:28 - last edited 2023-03-31 00:44:39
Model: ER605 (TL-R605)  
Hardware Version: V2
Firmware Version: 2.00

I am trying to install RE605 with the following configuration

 

 

=======

Internet

=======

     |

     |

==================

Other company's router

==================

               | ※IP:10.168.0.2

               |

------------------------------------------------

|                                                       |     

|                                                       |

|                                                       |  ※IP:10.168.0.218 (interface1)

PC1                                         =========

※IP:10.168.0.100                     ER605    ⇐ Added

                                                =========

                                                        |  ※IP:10.168.100.2 (interface2)

                                                        |

                                                     PC2

                                                       ※IP:10.168.100.100

 

 

communication requirements

1.Accessible from PC1 to PC2

2.Accessible from PC2 to PC1

3.Accessiable from PC1 to Internet

4.Accessiable from PC2 to Internet

 

So here's the question. I get timeout error only 4(Accessiable from PC2 to Internet).

It is possible serch google. but it doesn't open web site.

 

rooting is bealow

 

ID DestinationIP Subnet Mask Next HOP Interface Metric
1 0.0.0.0 128.0.0.0 10.168.0.2 1 0
2 10.168.100.0 255.255.255.0 0.0.0.0 2 0
3 10.168.0.0 255.255.255.0 10.168.0.2 1 0
4 127.0.0.0 255.0.0.0 0.0.0.0 lo 0
5 10.168.0.0 255.255.255.0 0.0.0.0 1 0
6 10.168.100.0 255.255.255.0 0.0.0.0 2 0
           

 

 

I am beginner as network engineer. I don't understand where is the problem.

please help me.

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#1
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12 Reply
Re:Please help me about routing
2023-03-30 14:33:10 - last edited 2023-03-31 00:44:39

  @2525rentcar 

 

Try making the PC2 IP (10_168_100_100) the DMZ IP for the ER605.

<< Paying it forward, one juicy problem at a time... >>
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#2
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Re:Please help me about routing
2023-03-31 00:43:44

  @d0ugmac1 

Thanks for reply.I will try your advice.

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#3
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Re:Please help me about routing
2023-03-31 02:08:05

  @2525rentcar 

I should probably have asked why that particular topology to make sure the router will do what you want it to.

<< Paying it forward, one juicy problem at a time... >>
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Re:Please help me about routing
2023-04-03 09:18:46

  @d0ugmac1 

 

As a result of my careful consideration it is unrealizable it set DMZ IP for PC2

I find PC2 IP doesn't change for other system.

 

why wanna install ER605 this network is IP for DHCP is 

depletion.

 

if you have other plan let know me

 

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#5
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Re:Please help me about routing
2023-04-03 12:06:24

  @2525rentcar 

 

I don't understand the context of 'depletion'.

 

Given your requirements, there is no reason for the ER605 at all.  If you are setting up a homelab to learn about networking, then you need to understand that the ER605 is not a classical router like say a Cisco is.  It always operates in NAT mode, so to the network above it, it looks like a host, not a gateway.  If there are hosts below the ER605 that need to be reachable, then the only way is to port forward every port that needs to be reachable (or DMZ which is the ultimate forward all ports option).  This is what makes PC2 appear as if its IP is 10.168.0.218 and allows it to communicate bidirectionally with PC1.  Said another way, there is no path where 10.168.0.100 can talk directly to 10.168.100.100 through any TPlink router.

<< Paying it forward, one juicy problem at a time... >>
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Re:Please help me about routing
2023-04-04 01:11:30 - last edited 2023-04-04 01:19:08

  @d0ugmac1 

 

Thank you for your kind reply and sorry my english is bad

What does  mean 'depletion' is No IP address assigned by DHCP server in 10.192.168.0.0 network.
There are many PCs other than PC1 in 10.192.168.0.0
so I wanna add other network in 10.192.168.0.0

 

what i don't know is why PC2 can't access to Internet.
PC1 and PC2 can communicate in both directions.


Does PC2 have to go through the WAN port on ER605 to access the Internet? 

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Re:Please help me about routing
2023-04-04 11:52:28

  @2525rentcar 

 

I think this is what you want to do?

 

Create two LAN subnets on the ER605, map them to two different LAN ports as below.

That will allow PC<->PC communications as well as internet access for both.

It will NOT allow Internet->PC access because the WAN1 port has a private (NAT'd) address (you need a public from the modem if that is to work and port forwards)

 

 

 

<< Paying it forward, one juicy problem at a time... >>
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#8
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Re:Please help me about routing
2023-04-05 00:37:28

  @d0ugmac1 

>It will NOT allow Internet->PC access

→yes! That's exactly right. I can search on google but I can't browse web site.

 

modem on your network diagram is other company router on my network diagram. and I can browse from PC1(10.168.0.100).

so I think it is possible it can browse web site from pc2.

 

Do you know It"s reason?

 

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Re:Please help me about routing
2023-04-05 01:39:55

  @2525rentcar 

It is difficult to answer your question. You did not indicate what device that routing table is from? Is it from PC2? It does not look like one from a Windows machine. The first row in that table seems to be a route to the default gateway for Internet. However, there is this “128.0.0.0” subnet mask there. The IP range covered by that route is 0.0.0.0 - 127.255.255.255 so there is a route to some but not all Internet IP addresses. BTW, you will not be able to do “1.Accessible from PC1 to PC2” in general. NAT on ER605 will not allow it.

Kris K
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Re:Please help me about routing
2023-04-05 02:15:58

  @KJK 

thank you for reply

 

That routing table is on ER605. and PC1 and PC2 are windows PC.

I wish set 0.0.0.0 subunet. it was error but then I set 0.0.0.0.

Do you know solution for it?

 

I will consider to accept it is not accessible from PC1 to PC2.

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#11
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