dhcpperf is a DHCP load testing tool.Continue reading “Testing a DHCP server with dhcpperf”
For example, I will configure DHCPv4 Relay on Cisco N3K-C3064PQ-10GX. Initially, I configured this switch for L2, but some VLANs had to be configured as L3 and DHCPv4 Relay enabled.Continue reading “Configuring DHCP Relay on Cisco Nexus 3064”
Nothing complicated, just create an ACL rule, due to which on certain ports the switch will drop or pass packets that go to client port 67 from a DHCP server and thus it will not receive IP from unnecessary DHCP servers.Continue reading “Blocking DHCP packets on D-Link DES-38xx”
I will give an example of setting up DHCP Snooping on MikroTik (RouterOS) to block third-party DHCP servers:Continue reading “Configuring DHCP Snooping on MikroTik”
dhcdrop is a utility for suppressing unnecessary DHCP servers and stress testing.Continue reading “Suppression of DHCP servers (dhcdrop)”
For example, I’ll take a FoxGate S6224-S4 switch; on other models, the configuration is almost the same.
First, enable the dhcp snooping function:
ip dhcp snooping enable
I will give an example of how on the Huawei Quidway S2300 switch (using the S2326TP-EI as an example) to allow receiving DHCP responses from the uplink port and prohibiting client responses.Continue reading “Block third-party DHCP servers on the Huawei Quidway S2300 (DHCP Snooping)”
Recently, it was necessary to configure the issuance of IP addresses to several old DOCSIS modems and the host located after the modem.
At hand was the Arris Cadant C3 and Thomson TCM-420 modems.
First of all, let’s start a DHCP server that will issue IP addresses to modems, for example, as I described in this article – Installing and configuring isc-dhcp-server.
And also we will launch a TFTP server on which there will be files for modems, for example, as I described in the article – Installing and Configuring a TFTP Server
Here’s an example of installing isc-dhcp-server in Ubuntu Server.Continue reading “Installing and configuring isc-dhcp-server in Ubuntu”
On the test, I configure DHCP Snooping on the Cisco Catalyst 6509-E to block third-party DHCP servers, on the other Cisco switches, the configuration is basically the same.
After connecting to the device immediately go to the configuration mode: