Posted by
Sean McMurray on
Jun 02, 2015; 7:47pm
URL: http://isc-dhcp-users.193.s1.nabble.com/dhcpd-doesn-t-acknowledge-dhcp-requests-tp124.html
I have a dhcp server that won't give out leases and doesn't acknowledge
DHCPDISCOVERs.
I see the requests come in with tcpdump, but the daemon doesn't log them
and doesn't respond.
failover peer "partner" {
primary;
address 10.64.0.104;
port 647;
peer address 10.64.0.112;
peer port 647;
max-response-delay 60;
max-unacked-updates 10;
mclt 3600;
split 255;
load balance max seconds 3;
}
subnet 10.112.0.0 netmask 255.248.0.0 {
log(info, concat(
"Lease: ",binary-to-ascii (10, 8, ".", leased-address)
," Mac: ",binary-to-ascii(16, 8, ":", substring(hardware,1, 6))
," Relay: ",option agent.remote-id
));
option routers 10.112.0.1;
pool {
range 10.112.1.0 10.112.255.255;
failover peer "partner";
}
}
> ip -4 a sh em2
45: em2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
inet 10.112.0.104/13 brd 10.119.255.255 scope global em2
valid_lft forever preferred_lft forever
> tcpdump -vv -i em2
IP (tos 0x0, ttl 255, id 48977, offset 0, flags [none], proto UDP (17),
length 339)
0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP,
Request from xx:xx:xx:xx:xx:xx (oui Unknown), length 311, xid
0x7f73db12, secs 53, Flags [none] (0x0000)
Client-Ethernet-Address xx:xx:xx:xx:xx:xx (oui Unknown)
Vendor-rfc1048 Extensions
Magic Cookie 0x63825363
DHCP-Message Option 53, length 1: Discover
Parameter-Request Option 55, length 9:
Subnet-Mask, Default-Gateway, Domain-Name-Server, Domain-Name
Option 119, LDAP, Option 252, Netbios-Name-Server
Netbios-Node
MSZ Option 57, length 2: 1500
Client-ID Option 61, length 7: ether xx:xx:xx:xx:xx:xx
Lease-Time Option 51, length 4: 7776000
Hostname Option 12, length 8: "Private_"
Agent-Information Option 82, length 25:
Circuit-ID SubOption 1, length 7: Anonymo
Remote-ID SubOption 2, length 14: 172.20.100.101
> tail /var/log/dhcpd
dhcpd: Sent update done message to partner
dhcpd: Update request from partner: nothing pending
failover peer partner: peer moves from potential-conflict to normal
dhcpd: failover peer partner: I move from conflict-done to normal
dhcpd: balancing pool 7fdb1b28a920 10.112.0.0/13 total 65280 free
32640 backup 32640 lts 0 max-own (+/-)6528
dhcpd: balanced pool 7fdb1b28a920 10.112.0.0/13 total 65280 free
32640 backup 32640 lts 0 max-misbal 9792
>ss -anlp | grep ':67'
tcp UNCONN 0 0 *:67 *:*
users:(("dhcpd",21614,9))
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