Given that there is a dhcp client, a relay agent and dhcp server. There is also another ftp server. Requirement is that the client starts the DORA process and the server responds with IP address and also sends the ftp server’s address. Is there any configuration or DHCP option available to achieve this? Thanks Answer … Read more
In my network I have a small docker swarm running several apps. Latest I tried to setup two new services offering DHCP with ispcpd and DNS with unbound to the network. Master of the swarm is a new QNAP NAS controlling several Pi3 (for availability, the SDCards sometimes crash in 24/7 use). The DHCP is … Read more
I would like to use class declarations based on a subnet scope, is that allowed? Or are all classes global scope? here is my dhcp.conf snippet: subnet 10.200.147.0 netmask 255.255.255.224 { authoritative; option domain-name-servers 10.200.17.28; option routers 10.200.147.1; option subnet-mask 255.255.255.224; class “Cisco AP c1240 22nd fl” { match if option vendor-class-identifier = “Cisco AP … Read more
DHCP Server OS – Windows Server Standard 2008 R2 DHCP Client OS – Windows 7, Linux based OS etc.. I have configured DHCP Server on Windows Server Standard 2008 R2 with SuperScope. Let assume that i have two Scope in SuperScope. VLAN 8 and VLAN 7. and with help of IP helper command i have … Read more
I have to configure isc-dhcp-server for 1 million clients which listens on 4094 vlan tagged interfaces, where each vlan interface is mapped to a subnet declaration. Therefore in total 4094 subnet declarations in conf file with 253 clients in each subnet pool. What I am observing is that dhcpd daemon is taking huge amount of … Read more
Just curious about this. When we enable option 81 on a DHCP network, the DHCP server will start updating the zone that comes along with the client’s FQDN. Now, how would client will ever know its domain even before getting an IP address? My apologies if the question sounds dumb. Thanks in advance, everyone. Answer … Read more
Is there any way to add long list routes to server? Actually now I can add only 32 routes because we have only 1 octet for them. After adding more than 32 routes I received “Malformed packet” by Wireshark. But Iam sure that I can add more than 32 routes because of this pic Which … Read more
RFC 1553 (DHCP Options) states: 3.2. End Option The end option marks the end of valid information in the vendor field. Subsequent octets should be filled with pad options. The code for the end option is 255, and its length is 1 octet. Code +—–+ | 255 | +—–+ https://www.rfc-editor.org/rfc/rfc1533#page-2 What does it mean to … Read more
When alpine linux asks for ipv4 address from dhcp server, it is not sending hostname to dhcp server. So I cant access by server’s hostname in LAN. Here is my setup I am using Alpine Linux 3.12 on my VM (not container), and arch is aarch64. The router runs openwrt 19.07.3 and BusyBox is v1.31.1 … Read more
My request is to include option 17 sub-options 11, 12 and 13 in DHCPv6 solicit/request and I configured the same in dhclient6.conf on my Ubuntu as below. send dhcp6.vendor-opts 00:00:0d:e9:00:0b:00:06:42:44:56:45:52:30:00:0c:00:03:6c:61:6e:00:0d:00:06:76:61:61:75:61:39; From packet trace I can see option 17 in solicit/request but sub-options are not proper and I guess not encapsulated. Output snippet from tshark: Vendor-specific … Read more
