Timeline for Do Directly Connected Routers Need Routing Protocols For DHCP Relay To Work?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Apr 24, 2023 at 1:23 | vote | accept | Shadi | ||
| Apr 23, 2023 at 7:39 | comment | added | Shadi | Thank you very much Ron, I can see what you were saying and it makes sense. I just realized that R03 needs to respond to the helper address port, which exists in a SUB that R03 does not have any kind of routes to. I just confused the fact that R03 has routes to R01 and R02 with the fact that it does not have routes to SUB01 and SUB 02 where, in fact, the helper addresses reside. Regarding the Broadcast, I meant that the PC does it initially. I fully understand that the helper use unicast as does R03 to respond. Thanks again. | |
| Apr 21, 2023 at 4:37 | history | edited | Ron Maupin♦ | CC BY-SA 4.0 |
added 1987 characters in body
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| Apr 20, 2023 at 17:07 | comment | added | Ron Maupin♦ | @Shadi, R3 does not know how to reach SUB1 and SUB2, and it needs to know that if it is to send packets to those networks. A router that does not know how to reach a network will drop packets destined to that network. Either use static routes or a routing protocol. | |
| Apr 20, 2023 at 16:51 | comment | added | Shadi |
Not SUB01 and SUB02 but R01 and R02. PC1, for example, does not need to know where R03 is. It just broadcasts. When it does, R01 should not drop the DHCP packet because the IP helper-address is configured on the port G0/0 (192.168.0.30/27) of R01, which in turn directly connected to R03 (The DHCP Server). And this is the whole idea of the DHCP Relay. Correct?
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| Apr 20, 2023 at 12:19 | comment | added | Ron Maupin♦ | @Shadi, no, SUB1 is not directly connected to R3, and neither is SUB2. You will need to either configure static routes to them on R3, or you will need to run a common routing protocol on all three routers, which is the preferred method because static configuration does not scale. R3 has no idea where SUB1 and SUB2 are, and it will simply drop any packets destined for those networks unless you somehow tell it how to reach those networks. | |
| Apr 20, 2023 at 6:23 | comment | added | Shadi | They are directly connected. Please take a look at the updated question | |
| Apr 18, 2023 at 20:10 | history | answered | Ron Maupin♦ | CC BY-SA 4.0 |