Re: [PATCH 6/6] doc: Add --dhcp-boot and --dhcp-opt to man page

On Mon, 18 May 2026 18:50:02 +0530 Anshu Kumari wrote:

Document the new --dhcp-boot and --dhcp-opt command-line options in the passt(1) man page, including supported option codes grouped by value type and usage examples.

Link: https://bugs.passt.top/show_bug.cgi?id=192 Signed-off-by: Anshu Kumari --- passt.1 | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+)

diff --git a/passt.1 b/passt.1 index 908fd4a..c39e5ec 100644 --- a/passt.1 +++ b/passt.1 @@ -430,6 +430,50 @@ Send \fIname\fR as DHCP option 12 (hostname). FQDN to configure the client with. Send \fIname\fR as Client FQDN: DHCP option 81 and DHCPv6 option 39.

+.TP +.BR \-\-dhcp-boot " " \fIurl +Boot file URL for network boot. +Populates the boot file field in DHCP replies. For UEFI HTTP boot, +also set the vendor class identifier using \-\-dhcp-opt 60,HTTPClient. + +.TP +.BR \-\-dhcp-opt " " \fICODE\fR,\fIVALUE\fR +Set a DHCP option by numeric code. The value format is determined automatically +from the option code. Multiple IP addresses are space-separated within quotes. +This option can be specified multiple times. Options set with \-\-dhcp-opt +override built-in values and \-\-dhcp-boot settings.

When we refer to other options, we highlight them, say: \fB--dhcp-boot\fR For further examples, look for "See option" or "Implies" in this file.

+Only the following option codes are supported (unsupported codes cause an error): +.RS +.TP +.B IPv4 address options +1 (Subnet Mask), 16 (Swap Server), 28 (Broadcast Address), 50 (Requested IP), +54 (Server Identifier) +.TP +.B IPv4 address list options +3 (Router), 4 (Time Server), 5 (Name Server), 6 (DNS), 7 (Log Server), +8 (Cookie Server), 9 (LPR Server), 10 (Impress Server), +11 (Resource Location Server), 33 (Static Routes), 41 (NIS Servers), +42 (NTP Servers), 44 (NetBIOS Name Server) +.TP +.B Integer options +2 (Time Offset, 32-bit), 13 (Boot File Size, 16-bit), 19 (IP Forwarding, 8-bit), +23 (Default IP TTL, 8-bit), 26 (Interface MTU, 16-bit), +37 (TCP Default TTL, 8-bit), 38 (TCP Keepalive Interval, 32-bit), +51 (IP Address Lease Time, 32-bit), +53 (DHCP Message Type, 8-bit), 57 (Max DHCP Message Size, 16-bit), +58 (Renewal Time, 32-bit), 59 (Rebinding Time, 32-bit) +.TP +.B String options +12 (Host Name), 15 (Domain Name), 17 (Root Path), 40 (NIS Domain Name), +60 (Vendor Class Identifier), 61 (Client Identifier), 66 (TFTP Server Name), +67 (Bootfile Name), 119 (Domain Search List), 252 (WPAD URL) +.TP +.B Classless static route options (RFC 3442 encoding) +121 (Classless Static Routes). +Format: "CIDR/mask,gateway" entries, space-separated. +Example: \-\-dhcp-opt 121,"10.0.1.0/24,10.0.0.1 0.0.0.0/0,10.0.0.1" +.RE + .TP .BR \-t ", " \-\-tcp-ports " " \fIspec Configure TCP port forwarding to guest or namespace. \fIspec\fR can be one of:

Except for pending comments from David and myself, the whole series looks good to me! I suppose that addressing those comments especially around 2/6 and 3/6 might take a few iterations, though. -- Stefano