DHCP: ARP issue, FR2.x vs FR 3.x

Fajar A. Nugraha list at fajar.net
Fri Jan 13 09:49:12 CET 2012


I'm trying to test a simple DHCP server implementation using FR. The setup:
- server is using dummy1 interface for dhcp server test purposes, IP
172.16.101.1
- client is using virtualbox running on server, with client's eth0
bridged to server's dummy1, tested using client's "dhclient" command.
- basic DHCP test using dnsmasq and FR 3 (with freeradius -X) on
server works fine, so there's no issue about using dummy interface and
virtualbox.

Then I test FR 2.2.0 (from v2.1.x git). The dhcp listen section is
different, so I adusted it accordingly. But there seems to be a
problem with arp, and the reply never recached the client (also
confirmed with tcpdump). Any idea how to make FR2's DHCP work, or at
least behaves similar to FR3?

FR2 debug log:

#===========================================================================
root at HP:/# freeradius -X
FreeRADIUS Version 2.2.0, for host i686-pc-linux-gnu, built on Jan 11
2012 at 17:20:48
Copyright (C) 1999-2009 The FreeRADIUS server project and contributors.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
You may redistribute copies of FreeRADIUS under the terms of the
GNU General Public License v2.
Starting - reading configuration files ...
including configuration file /etc/freeradius/radiusd.conf
including configuration file /etc/freeradius/proxy.conf
including configuration file /etc/freeradius/clients.conf
including files in directory /etc/freeradius/modules/
including configuration file /etc/freeradius/modules/radutmp
including configuration file /etc/freeradius/modules/realm
including configuration file /etc/freeradius/modules/detail.log
including configuration file /etc/freeradius/modules/linelog
including configuration file /etc/freeradius/modules/rediswho
including configuration file /etc/freeradius/modules/krb5
including configuration file /etc/freeradius/modules/expr
including configuration file /etc/freeradius/modules/cui
including configuration file /etc/freeradius/modules/replicate
including configuration file /etc/freeradius/modules/sradutmp
including configuration file /etc/freeradius/modules/checkval
including configuration file /etc/freeradius/modules/digest
including configuration file /etc/freeradius/modules/policy
including configuration file /etc/freeradius/modules/unix
including configuration file /etc/freeradius/modules/opendirectory
including configuration file /etc/freeradius/modules/counter
including configuration file /etc/freeradius/modules/perl
including configuration file /etc/freeradius/modules/chap
including configuration file /etc/freeradius/modules/redis
including configuration file /etc/freeradius/modules/attr_filter
including configuration file /etc/freeradius/modules/ntlm_auth
including configuration file /etc/freeradius/modules/mac2ip
including configuration file /etc/freeradius/modules/files
including configuration file /etc/freeradius/modules/etc_group
including configuration file /etc/freeradius/modules/expiration
including configuration file /etc/freeradius/modules/smsotp
including configuration file /etc/freeradius/modules/exec
including configuration file /etc/freeradius/modules/acct_unique
including configuration file /etc/freeradius/modules/ippool
including configuration file /etc/freeradius/modules/detail.example.com
including configuration file /etc/freeradius/modules/inner-eap
including configuration file /etc/freeradius/modules/pap
including configuration file /etc/freeradius/modules/wimax
including configuration file /etc/freeradius/modules/mschap
including configuration file /etc/freeradius/modules/pam
including configuration file /etc/freeradius/modules/smbpasswd
including configuration file /etc/freeradius/modules/otp
including configuration file /etc/freeradius/modules/echo
including configuration file /etc/freeradius/modules/sql_log
including configuration file /etc/freeradius/modules/soh
including configuration file /etc/freeradius/modules/ldap
including configuration file /etc/freeradius/modules/preprocess
including configuration file /etc/freeradius/modules/always
including configuration file /etc/freeradius/modules/mac2vlan
including configuration file /etc/freeradius/modules/sqlcounter_expire_on_login
including configuration file /etc/freeradius/modules/attr_rewrite
including configuration file /etc/freeradius/modules/logintime
including configuration file /etc/freeradius/modules/dynamic_clients
including configuration file /etc/freeradius/modules/detail
including configuration file /etc/freeradius/modules/passwd
including configuration file /etc/freeradius/modules/radrelay
including configuration file /etc/freeradius/eap.conf
including configuration file /etc/freeradius/policy.conf
including files in directory /etc/freeradius/sites-enabled/
including configuration file /etc/freeradius/sites-enabled/default
including configuration file /etc/freeradius/sites-enabled/inner-tunnel
including configuration file /etc/freeradius/sites-enabled/dhcp
main {
	user = "freerad"
	group = "freerad"
	allow_core_dumps = no
}
including dictionary file /etc/freeradius/dictionary
main {
	name = "freeradius"
	prefix = "/usr"
	localstatedir = "/var"
	sbindir = "/usr/sbin"
	logdir = "/var/log/freeradius"
	run_dir = "/var/run/freeradius"
	libdir = "/usr/lib/freeradius"
	radacctdir = "/var/log/freeradius/radacct"
	hostname_lookups = no
	max_request_time = 30
	cleanup_delay = 5
	max_requests = 1024
	pidfile = "/var/run/freeradius/freeradius.pid"
	checkrad = "/usr/sbin/checkrad"
	debug_level = 0
	proxy_requests = yes
 log {
	stripped_names = no
	auth = no
	auth_badpass = no
	auth_goodpass = no
 }
 security {
	max_attributes = 200
	reject_delay = 1
	status_server = yes
 }
}
radiusd: #### Loading Realms and Home Servers ####
 proxy server {
	retry_delay = 5
	retry_count = 3
	default_fallback = no
	dead_time = 120
	wake_all_if_all_dead = no
 }
 home_server localhost {
	ipaddr = 127.0.0.1
	port = 1812
	type = "auth"
	secret = "testing123"
	response_window = 20
	max_outstanding = 65536
	require_message_authenticator = yes
	zombie_period = 40
	status_check = "status-server"
	ping_interval = 30
	check_interval = 30
	num_answers_to_alive = 3
	num_pings_to_alive = 3
	revive_interval = 120
	status_check_timeout = 4
  coa {
	irt = 2
	mrt = 16
	mrc = 5
	mrd = 30
  }
 }
 home_server_pool my_auth_failover {
	type = fail-over
	home_server = localhost
 }
 realm example.com {
	auth_pool = my_auth_failover
 }
 realm LOCAL {
 }
radiusd: #### Loading Clients ####
 client localhost {
	ipaddr = 127.0.0.1
	require_message_authenticator = no
	secret = "testing123"
	nastype = "other"
 }
radiusd: #### Instantiating modules ####
 instantiate {
 Module: Linked to module rlm_exec
 Module: Instantiating module "exec" from file /etc/freeradius/modules/exec
  exec {
	wait = no
	input_pairs = "request"
	shell_escape = yes
  }
 Module: Linked to module rlm_expr
 Module: Instantiating module "expr" from file /etc/freeradius/modules/expr
 Module: Linked to module rlm_expiration
 Module: Instantiating module "expiration" from file
/etc/freeradius/modules/expiration
  expiration {
	reply-message = "Password Has Expired  "
  }
 Module: Linked to module rlm_logintime
 Module: Instantiating module "logintime" from file
/etc/freeradius/modules/logintime
  logintime {
	reply-message = "You are calling outside your allowed timespan  "
	minimum-timeout = 60
  }
 }
radiusd: #### Loading Virtual Servers ####
server { # from file /etc/freeradius/radiusd.conf
 modules {
  Module: Creating Auth-Type = digest
  Module: Creating Post-Auth-Type = REJECT
 Module: Checking authenticate {...} for more modules to load
 Module: Linked to module rlm_pap
 Module: Instantiating module "pap" from file /etc/freeradius/modules/pap
  pap {
	encryption_scheme = "auto"
	auto_header = no
  }
 Module: Linked to module rlm_chap
 Module: Instantiating module "chap" from file /etc/freeradius/modules/chap
 Module: Linked to module rlm_mschap
 Module: Instantiating module "mschap" from file /etc/freeradius/modules/mschap
  mschap {
	use_mppe = yes
	require_encryption = no
	require_strong = no
	with_ntdomain_hack = no
	allow_retry = yes
  }
 Module: Linked to module rlm_digest
 Module: Instantiating module "digest" from file /etc/freeradius/modules/digest
 Module: Linked to module rlm_unix
 Module: Instantiating module "unix" from file /etc/freeradius/modules/unix
  unix {
	radwtmp = "/var/log/freeradius/radwtmp"
  }
 Module: Linked to module rlm_eap
 Module: Instantiating module "eap" from file /etc/freeradius/eap.conf
  eap {
	default_eap_type = "md5"
	timer_expire = 60
	ignore_unknown_eap_types = no
	cisco_accounting_username_bug = no
	max_sessions = 4096
  }
 Module: Linked to sub-module rlm_eap_md5
 Module: Instantiating eap-md5
 Module: Linked to sub-module rlm_eap_leap
 Module: Instantiating eap-leap
 Module: Linked to sub-module rlm_eap_gtc
 Module: Instantiating eap-gtc
   gtc {
	challenge = "Password: "
	auth_type = "PAP"
   }
 Module: Linked to sub-module rlm_eap_tls
 Module: Instantiating eap-tls
   tls {
	rsa_key_exchange = no
	dh_key_exchange = yes
	rsa_key_length = 512
	dh_key_length = 512
	verify_depth = 0
	CA_path = "/etc/freeradius/certs"
	pem_file_type = yes
	private_key_file = "/etc/freeradius/certs/server.key"
	certificate_file = "/etc/freeradius/certs/server.pem"
	CA_file = "/etc/freeradius/certs/ca.pem"
	private_key_password = "whatever"
	dh_file = "/etc/freeradius/certs/dh"
	random_file = "/dev/urandom"
	fragment_size = 1024
	include_length = yes
	check_crl = no
	cipher_list = "DEFAULT"
	make_cert_command = "/etc/freeradius/certs/bootstrap"
	ecdh_curve = "prime256v1"
    cache {
	enable = no
	lifetime = 24
	max_entries = 255
    }
    verify {
    }
    ocsp {
	enable = no
	override_cert_url = yes
	url = "http://127.0.0.1/ocsp/"
    }
   }
 Module: Linked to sub-module rlm_eap_ttls
 Module: Instantiating eap-ttls
   ttls {
	default_eap_type = "md5"
	copy_request_to_tunnel = no
	use_tunneled_reply = no
	virtual_server = "inner-tunnel"
	include_length = yes
   }
 Module: Linked to sub-module rlm_eap_peap
 Module: Instantiating eap-peap
   peap {
	default_eap_type = "mschapv2"
	copy_request_to_tunnel = no
	use_tunneled_reply = no
	proxy_tunneled_request_as_eap = yes
	virtual_server = "inner-tunnel"
	soh = no
   }
 Module: Linked to sub-module rlm_eap_mschapv2
 Module: Instantiating eap-mschapv2
   mschapv2 {
	with_ntdomain_hack = no
	send_error = no
   }
 Module: Checking authorize {...} for more modules to load
 Module: Linked to module rlm_preprocess
 Module: Instantiating module "preprocess" from file
/etc/freeradius/modules/preprocess
  preprocess {
	huntgroups = "/etc/freeradius/huntgroups"
	hints = "/etc/freeradius/hints"
	with_ascend_hack = no
	ascend_channels_per_line = 23
	with_ntdomain_hack = no
	with_specialix_jetstream_hack = no
	with_cisco_vsa_hack = no
	with_alvarion_vsa_hack = no
  }
 Module: Linked to module rlm_realm
 Module: Instantiating module "suffix" from file /etc/freeradius/modules/realm
  realm suffix {
	format = "suffix"
	delimiter = "@"
	ignore_default = no
	ignore_null = no
  }
 Module: Linked to module rlm_files
 Module: Instantiating module "files" from file /etc/freeradius/modules/files
  files {
	usersfile = "/etc/freeradius/users"
	acctusersfile = "/etc/freeradius/acct_users"
	preproxy_usersfile = "/etc/freeradius/preproxy_users"
	compat = "no"
  }
 Module: Checking preacct {...} for more modules to load
 Module: Linked to module rlm_acct_unique
 Module: Instantiating module "acct_unique" from file
/etc/freeradius/modules/acct_unique
  acct_unique {
	key = "User-Name, Acct-Session-Id, NAS-IP-Address, Client-IP-Address, NAS-Port"
  }
 Module: Checking accounting {...} for more modules to load
 Module: Linked to module rlm_detail
 Module: Instantiating module "detail" from file /etc/freeradius/modules/detail
  detail {
	detailfile = "/var/log/freeradius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/detail-%Y%m%d"
	header = "%t"
	detailperm = 384
	dirperm = 493
	locking = no
	log_packet_header = no
  }
 Module: Linked to module rlm_radutmp
 Module: Instantiating module "radutmp" from file
/etc/freeradius/modules/radutmp
  radutmp {
	filename = "/var/log/freeradius/radutmp"
	username = "%{User-Name}"
	case_sensitive = yes
	check_with_nas = yes
	perm = 384
	callerid = yes
  }
 Module: Linked to module rlm_attr_filter
 Module: Instantiating module "attr_filter.accounting_response" from
file /etc/freeradius/modules/attr_filter
  attr_filter attr_filter.accounting_response {
	attrsfile = "/etc/freeradius/attrs.accounting_response"
	key = "%{User-Name}"
	relaxed = no
  }
 Module: Checking session {...} for more modules to load
 Module: Checking post-proxy {...} for more modules to load
 Module: Checking post-auth {...} for more modules to load
 Module: Instantiating module "attr_filter.access_reject" from file
/etc/freeradius/modules/attr_filter
  attr_filter attr_filter.access_reject {
	attrsfile = "/etc/freeradius/attrs.access_reject"
	key = "%{User-Name}"
	relaxed = no
  }
 } # modules
} # server
server inner-tunnel { # from file /etc/freeradius/sites-enabled/inner-tunnel
 modules {
 Module: Checking authenticate {...} for more modules to load
 Module: Checking authorize {...} for more modules to load
 Module: Checking session {...} for more modules to load
 Module: Checking post-proxy {...} for more modules to load
 Module: Checking post-auth {...} for more modules to load
 } # modules
} # server
server dhcp { # from file /etc/freeradius/sites-enabled/dhcp
 modules {
 Module: Checking dhcp DHCP-Discover {...} for more modules to load
 Module: Linked to module rlm_passwd
 Module: Instantiating module "mac2ip" from file /etc/freeradius/modules/mac2ip
  passwd mac2ip {
	filename = "/etc/freeradius/mac2ip"
	format = "*DHCP-Client-Hardware-Address:=DHCP-Your-IP-Address"
	delimiter = ","
	ignorenislike = yes
	ignoreempty = yes
	allowmultiplekeys = no
	hashsize = 100
  }
rlm_passwd: nfields: 2 keyfield 0(DHCP-Client-Hardware-Address) listable: no
 Module: Linked to module rlm_always
 Module: Instantiating module "ok" from file /etc/freeradius/modules/always
  always ok {
	rcode = "ok"
	simulcount = 0
	mpp = no
  }
 Module: Checking dhcp DHCP-Request {...} for more modules to load
 Module: Checking dhcp (null) {...} for more modules to load
/etc/freeradius/sites-enabled/dhcp[237]: No name specified for
Post-Auth-Type block
 } # modules
} # server
radiusd: #### Opening IP addresses and Ports ####
listen {
	type = "auth"
	ipaddr = *
	port = 0
}
listen {
	type = "acct"
	ipaddr = *
	port = 0
}
listen {
	type = "auth"
	ipaddr = 127.0.0.1
	port = 18120
}
listen {
	type = "dhcp"
	ipaddr = 255.255.255.255
	port = 67
	interface_ipaddr = 172.16.101.1
}
listen {
	type = "dhcp"
	ipaddr = 172.16.101.1
	port = 67
}
 ... adding new socket proxy address * port 49208
Listening on authentication address * port 1812
Listening on accounting address * port 1813
Listening on authentication address 127.0.0.1 port 18120 as server inner-tunnel
Listening on dhcp interface dummy1 address 255.255.255.255 port 67 as
server dhcp
Listening on dhcp address 172.16.101.1 port 67 as server dhcp
Listening on proxy address * port 1814
Ready to process requests.
Received DHCP-Discover of id 3ecf5c31 from 0.0.0.0:68 to 255.255.255.255:67
	DHCP-Opcode = Client-Message
	DHCP-Hardware-Type = Ethernet
	DHCP-Hardware-Address-Length = 6
	DHCP-Hop-Count = 0
	DHCP-Transaction-Id = 1053776945
	DHCP-Number-of-Seconds = 0
	DHCP-Flags = 0
	DHCP-Client-IP-Address = 0.0.0.0
	DHCP-Your-IP-Address = 0.0.0.0
	DHCP-Server-IP-Address = 0.0.0.0
	DHCP-Gateway-IP-Address = 0.0.0.0
	DHCP-Client-Hardware-Address = 08:00:27:a2:13:b9
	DHCP-Message-Type = DHCP-Discover
	DHCP-Parameter-Request-List = DHCP-Subnet-Mask
	DHCP-Parameter-Request-List = DHCP-Broadcast-Address
	DHCP-Parameter-Request-List = DHCP-Time-Offset
	DHCP-Parameter-Request-List = DHCP-Router-Address
	DHCP-Parameter-Request-List = DHCP-Domain-Name
	DHCP-Parameter-Request-List = DHCP-Domain-Name-Server
	DHCP-Parameter-Request-List = DHCP-Hostname
	DHCP-Parameter-Request-List = DHCP-NTP-Servers
server dhcp {
Trying sub-section dhcp DHCP-Discover {...}
+- entering group DHCP-Discover {...}
++[reply] returns noop
++[reply] returns noop
[mac2ip] Added DHCP-Your-IP-Address: '172.16.101.101' to reply_items
++[mac2ip] returns ok
++[ok] returns ok
} # server dhcp
	DHCP-Subnet-Mask = 255.255.255.0
	DHCP-Router-Address = 172.16.101.1
	DHCP-Domain-Name-Server = 8.8.8.8
	DHCP-IP-Address-Lease-Time = 60
	DHCP-DHCP-Server-Identifier = 172.16.101.1
Sending DHCP-Offer of id 3ecf5c31 from 172.16.101.1:67 to 172.16.101.101:68
Finished request 0.
Cleaning up request 0 ID 1053776945 with timestamp +12
Going to the next request
Ready to process requests.
Received DHCP-Discover of id 3ecf5c31 from 0.0.0.0:68 to 255.255.255.255:67
	DHCP-Opcode = Client-Message
	DHCP-Hardware-Type = Ethernet
	DHCP-Hardware-Address-Length = 6
	DHCP-Hop-Count = 0
	DHCP-Transaction-Id = 1053776945
	DHCP-Number-of-Seconds = 4
	DHCP-Flags = 0
	DHCP-Client-IP-Address = 0.0.0.0
	DHCP-Your-IP-Address = 0.0.0.0
	DHCP-Server-IP-Address = 0.0.0.0
	DHCP-Gateway-IP-Address = 0.0.0.0
	DHCP-Client-Hardware-Address = 08:00:27:a2:13:b9
	DHCP-Message-Type = DHCP-Discover
	DHCP-Parameter-Request-List = DHCP-Subnet-Mask
	DHCP-Parameter-Request-List = DHCP-Broadcast-Address
	DHCP-Parameter-Request-List = DHCP-Time-Offset
	DHCP-Parameter-Request-List = DHCP-Router-Address
	DHCP-Parameter-Request-List = DHCP-Domain-Name
	DHCP-Parameter-Request-List = DHCP-Domain-Name-Server
	DHCP-Parameter-Request-List = DHCP-Hostname
	DHCP-Parameter-Request-List = DHCP-NTP-Servers
server dhcp {
Trying sub-section dhcp DHCP-Discover {...}
+- entering group DHCP-Discover {...}
++[reply] returns noop
++[reply] returns noop
[mac2ip] Added DHCP-Your-IP-Address: '172.16.101.101' to reply_items
++[mac2ip] returns ok
++[ok] returns ok
} # server dhcp
	DHCP-Subnet-Mask = 255.255.255.0
	DHCP-Router-Address = 172.16.101.1
	DHCP-Domain-Name-Server = 8.8.8.8
	DHCP-IP-Address-Lease-Time = 60
	DHCP-DHCP-Server-Identifier = 172.16.101.1
Sending DHCP-Offer of id 3ecf5c31 from 172.16.101.1:67 to 172.16.101.101:68
Finished request 1.
Cleaning up request 1 ID 1053776945 with timestamp +16
Going to the next request
Ready to process requests.
#===========================================================================


tcpdump output from the server
#===========================================================================
15:39:47.611809 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none],
proto UDP (17), length 328)
    0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from
08:00:27:a2:13:b9, length 300, xid 0x3ecf5c31, Flags [none]
	  Client-Ethernet-Address 08:00:27:a2:13:b9
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Parameter-Request Option 55, length 8:
	      Subnet-Mask, BR, Time-Zone, Default-Gateway
	      Domain-Name, Domain-Name-Server, Hostname, NTP
15:39:47.611830 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none],
proto UDP (17), length 328)
    0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from
08:00:27:a2:13:b9, length 300, xid 0x3ecf5c31, Flags [none]
	  Client-Ethernet-Address 08:00:27:a2:13:b9
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Parameter-Request Option 55, length 8:
	      Subnet-Mask, BR, Time-Zone, Default-Gateway
	      Domain-Name, Domain-Name-Server, Hostname, NTP
15:39:47.616432 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
172.16.101.101 tell 172.16.101.1, length 28
15:39:48.616525 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
172.16.101.101 tell 172.16.101.1, length 28
15:39:49.616483 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
172.16.101.101 tell 172.16.101.1, length 28
15:39:51.613941 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none],
proto UDP (17), length 328)
    0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from
08:00:27:a2:13:b9, length 300, xid 0x3ecf5c31, secs 4, Flags [none]
	  Client-Ethernet-Address 08:00:27:a2:13:b9
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Parameter-Request Option 55, length 8:
	      Subnet-Mask, BR, Time-Zone, Default-Gateway
	      Domain-Name, Domain-Name-Server, Hostname, NTP
15:39:51.613964 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none],
proto UDP (17), length 328)
    0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from
08:00:27:a2:13:b9, length 300, xid 0x3ecf5c31, secs 4, Flags [none]
	  Client-Ethernet-Address 08:00:27:a2:13:b9
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message Option 53, length 1: Discover
	    Parameter-Request Option 55, length 8:
	      Subnet-Mask, BR, Time-Zone, Default-Gateway
	      Domain-Name, Domain-Name-Server, Hostname, NTP
15:39:51.616438 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
172.16.101.101 tell 172.16.101.1, length 28
15:39:52.616460 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
172.16.101.101 tell 172.16.101.1, length 28
15:39:53.616516 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
172.16.101.101 tell 172.16.101.1, length 28
#===========================================================================

-- 
Fajar



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