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Today's Topics:
1. dhcp relay (Alan Batie)
----------------------------------------------------------------------
Message: 1
Date: Wed, 25 Nov 2020 18:54:07 -0800
From: Alan Batie <a...@peak.org>
To: dhcp-users@lists.isc.org
Subject: dhcp relay
Message-ID: <e5c88c68-a998-e0e4-e5d0-0e123eb6f...@peak.org>
Content-Type: text/plain; charset=utf-8
I'm trying to setup dhcp relay and not sure how the server determines
the network to assign an address from? The agent device (a Calix E7)
requires that the uplink vlan be different from the client vlan, so the
agent address is the uplink address of the device (which doesn't have an
address on the client vlan anyhow as it's mostly a switch):
Bootstrap Protocol
Message type: Boot Request (1)
Hardware type: Ethernet (0x01)
Hardware address length: 6
Hops: 0
Transaction ID: 0xa217414b
Seconds elapsed: 21935
Bootp flags: 0x0000 (Unicast)
0... .... .... .... = Broadcast flag: Unicast
.000 0000 0000 0000 = Reserved flags: 0x0000
Client IP address: 0.0.0.0 (0.0.0.0)
Your (client) IP address: 0.0.0.0 (0.0.0.0)
Next server IP address: 0.0.0.0 (0.0.0.0)
Relay agent IP address: 172.20.44.15 (172.20.44.15)
Client MAC address: 48:77:46:f9:5b:b0 (48:77:46:f9:5b:b0)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type
Length: 1
DHCP: Discover (1)
Option: (57) Maximum DHCP Message Size
Length: 2
Maximum DHCP Message Size: 576
Option: (55) Parameter Request List
Length: 11
Parameter Request List Item: (1) Subnet Mask
Parameter Request List Item: (3) Router
Parameter Request List Item: (6) Domain Name Server
Parameter Request List Item: (12) Host Name
Parameter Request List Item: (15) Domain Name
Parameter Request List Item: (28) Broadcast Address
Parameter Request List Item: (42) Network Time Protocol Servers
Parameter Request List Item: (43) Vendor-Specific Information
Parameter Request List Item: (120) SIP Servers
Parameter Request List Item: (121) Classless Static Route
Parameter Request List Item: (125) V-I Vendor-specific Information
Option: (60) Vendor class identifier
Length: 24
Vendor class identifier: GS4220E.ONT.dslforum.org
Option: (82) Agent Information Option
Length: 96
Option 82 Suboption: (1) Agent Circuit ID
Length: 58
Agent Circuit ID:
73706172652d65372d312e696e7472616e65742e7065616b...
Option 82 Suboption: (2) Agent Remote ID
Length: 34
Agent Remote ID:
73706172652d65372d312e696e7472616e65742e7065616b...
Option: (255) End
Option End: 255
Padding
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Subject: Digest Footer
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End of dhcp-users Digest, Vol 145, Issue 20
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