DHCPv6 using Option 59 (OPT_BOOTFILE_URL) to supply script/config location.DHCPv4 using Option 67 (bootfile-name) to supply script/config location.DHCPv4 using BOOTP filename to supply script/config location.To understand the variety of options available to classify the router when it first identifies itself to the DHCP server and to supply the required script, let’s look at packet captures in the following scenarios: IOS-XR is no exception and as Patrick’s excellent tutorial illustrates:Ī lot of headway has been made in enabling IOS-XR to be completely scriptable as soon as it is powered on. Over the years as devices became natively scriptable, a script of the user’s choice may be downloaded to automate provisioning of the entire system (NOS, agents, scripts etc.) on the whole and not just the configuration of the Network OS. There are dozens of techniques that vendors have brought forward over the years to enable users to push a configuration down to their devices often using on-premise DHCP servers and encoding the communication with the device within DHCP options. “The network device should never have to be configured manually through its console - from the instant that it is powered on right up until the services are brought up and telemetry data starts flowing.” It brings forth a mindset that is quite emblematic of the way Large Scale (Web) Service providers provision their environment: Zero Touch Provisioning is quite often considered the cornerstone of web scale deployment practices. DHCPv6 Advertise (DHCP Server to Router).DHCPv6 SOLICIT (Router to DHCPv6 Server).DHCPv4 using Option 67 bootfile-name (IOS-XR Release 6.2.25+).There is also a wide range of tools such as NetworkMiner available to view and analyze packet captures generated from app trafficĭo you have any successes or failures grabbing packet captures from iOS devices? Please share in the comments.IOS-XR ZTP: Learning through Packet Captures The effectiveness of these techniques can be limited but it is much safer to get packet captures compared to jailbreaking devices, and is fully supported by Apple. This works because the initial connection to encrypted websites is not immediately encrypted and the will often provide some basic information such as the host and URL and the certificate issuer ![]()
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