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SENDIP(1) FSF SENDIP(1) NAME sendip - Send arbitrary IP packets SYNOPSIS sendip [-v] [-d data] [-h] [-f datafile] [-p module] [module options] hostname OPTIONS -d data add this data as a string to the end of the packet Data can be: rN to generate N random(ish) data bytes; 0x or 0X followed by hex digits; 0 followed by octal digits; any other stream of bytes -f datafile read packet data from file -h print this message -p module load the specified module (see below) -v be verbose Modules are loaded in the order the -p option appears. The headers from each module are put immediately inside the headers from the pre- vios model in the final packet. For example, to embed bgp inside tcp inside ipv4, do sendip -p ipv4 -p tcp -p bgp .... Modules available at compile time: ipv4 ipv6 icmp tcp udp bgp rip ntp Arguments for module ./bgp.so: -bm x BGP Marker field (format is <hex byte>:<hex byte>:...) Default: FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF:FF -bl x Packet length Default: Correct -bt x Message Type (1 OPEN, 2 UPDATE, 3 NOTIFICATION, 4 KEEPALIVE Default: 4 (KEEPALIVE) -bo x Open message. Format is <version>:<AS number>:<Hold time>:<BGP Identifier>:<Options length> Default: 4:1:90:127.0.0.1:Correct (Any parameter can be omitted to get the default) -boo x Optional OPEN parameter. Format is <Type>:<Length>:<Value> - value is in hex bytes separated by :s Default: Length may be omitted to get correct value -bul x Withdrawn routes length Default: Correct -buw x Withdrawn route. Format is x.x.x.x/n:<bytes for prefix> Default: Bytes field may be omitted to use the correct number -bus x Attributes length Default: Correct -bua x Attribute. Format is <flags>:<type>:<length length (1 or 2):<length>:<data> Default: The length fields may be omitted to use the correct value -bun x NLRI Prefix. Format is as for -buw Default: As for -buw -bn x Notification. Format is <code>:<subcode>:<data> Default: Data may be omitted for no data Arguments for module ./icmp.so: -ct x ICMP message type Default: ICMP_ECHO (8), or ICMP6_ECHO_REQUEST (128) if embedded in an IPv6 packet -cd x ICMP code Default: 0 -cc x ICMP checksum Default: Correct Arguments for module ./ipv4.so: -is x Source IP address (see README) Default: 127.0.0.1 -id x Desitnation IP address Default: Correct -ih x IP header length (see README) Default: Correct -iv x IP version (you almost definately don't want to change this) Default: 4 -iy x IP type of service Default: 0 -il x Total IP packet length (see README) Default: Correct -ii x IP packet ID (see README) Default: Random -ifr x IP reservced flag (see README) Default: 0 (options are 0,1,r) -ifd x IP don't fragment flag (see README) Default: 0 (options are 0,1,r) -ifm x IP more fragments flag (see README) Default: 0 (options are 0,1,r) -if x IP fragment offset Default: 0 -it x IP time to live Default: 255 -ip x IP protcol Default: 0, or set by underlying protocol -ic x IP checksum (see README) Default: Correct -ionum x IP option as string of hex bytes (length is always correct) Default: (no options) -ioeol IP option: end of list -ionop IP option: no-op -iorr x IP option: record route. Format: pointer:addr1:addr2:... -iots x IP option: timestamp. Format: pointer:over- flow:flag:(ip1:)ts1:(ip2:)ts2:... -iolsr x IP option: loose source route. Format: pointer:addr1:addr2:... -iosid x IP option: stream identifier -iossr x IP option: strict source route. Format: pointer:addr1:addr2:... Arguments for module ./ipv6.so: -6f x IPv6 flow ID Default: 32 -6t x IPv6 traffic class Default: 0 -6l x IPv6 payload length Default: Correct -6n x IPv6 next header Default: IPPROTO_NONE -6h x IPv6 hop limit Default: 32 -6v x IP version (you probably don't want to change this -6p x IPv6 priority Default: 0 -6s x IPv6 source address Default: ::1 -6d x IPv6 destination address Default: Correct Arguments for module ./ntp.so: -nl x NTP Leap Indicator Default: 00 (no warning) -ns x NTP status Default: 0 (clock operating OK) -nt x NTP type Default: 0 (unspecified) -np x NTP precision Default: 0 -ne x NTP estimated error Default: 0.0 -nd x NTP estimated drift rate Default: 0.0 -nr x NTP reference clock ID (string or IP or number) Default: 0 -nf x NTP reference timestamp Default: 0.0 -no x NTP originate timestamp Default: 0.0 -na x NTP arrival (receive) timestamp Default: 0.0 -nx x NTP xmit (transmit) timestamp Default: 0.0 Arguments for module ./rip.so: -rv x RIP version Default: 2 -rc x RIP command (1=request, 2=response, 3=traceon (obsolete), 4=traceoff (obsolete), 5=poll (undocumented), 6=poll entry (un- documented) Default: 1 -re x Add a RIP entry. Format is: Address family:route tag:ad- dress:subnet mask:next hop:metric Default: 2:0:0.0.0.0:255.255.255.0:0.0.0.0:16, any option my be left out to use the default -ra x RIP authenticat packet, argument is the password; do not use any other RIP options on this RIP header -rd RIP default request - get router's entire routing table; do not use any other RIP options on this RIP header Arguments for module ./ripng.so: -Rv x RIPng version Default: 1 -Rc x RIPng command (1=request, 2=response) Default: 1 -Rr x RIPng reserved field (should be 0) Default: 0 -Re x Add a RIPng entry. Format is: Address/route tag/ad- dress/len/metric Default: ::/0/128/1, any option my be left out to use the de- fault -Rd RIPng default request - get router's entire routing table; do not use any other RIPng options on this RIPng header Arguments for module ./tcp.so: -ts x TCP source port Default: 0 -td x TCP destination port Default: 0 -tn x TCP sequence number Default: Random -ta x TCP ack number Default: 0 -tt x TCP data offset Default: Correct -tr x TCP header reserved field EXCLUDING ECN and CWR bits Default: 0 -tfe x TCP ECN bit (rfc2481) Default: 0 (options are 0,1,r) -tfc x TCP CWR bit (rfc2481) Default: 0 (options are 0,1,r) -tfu x TCP URG bit Default: 0, or 1 if -tu specified (options are 0,1,r) -tfa x TCP ACK bit Default: 0, or 1 if -ta specified (options are 0,1,r) -tfp x TCP PSH bit Default: 0 (options are 0,1,r) -tfr x TCP RST bit Default: 0 (options are 0,1,r) -tfs x TCP SYN bit Default: 1 (options are 0,1,r) -tff x TCP FIN bit Default: 0 (options are 0,1,r) -tw x TCP window size Default: 65535 -tc x TCP checksum Default: Correct -tu x TCP urgent pointer Default: 0 -tonum x TCP option as string of hex bytes (length is always correct) Default: (no options) -toeol TCP option: end of list -tonop TCP option: no op -tomss x TCP option: maximum segment size -towscale x TCP option: window scale (rfc1323) -tosackok TCP option: allow selective ack (rfc2018) -tosack x TCP option: selective ack (rfc2018), format is l_edge1:r_edge1,l_edge2:r_edge2... -tots x TCP option: timestamp (rfc1323), format is tsval:tsecr Arguments for module ./udp.so: -us x UDP source port Default: 0 -ud x UDP destination port Default: 0 -ul x UDP packet legnth Default: Correct -uc x UDP checksum Default: Correct sendip 2.5 November 2025 SENDIP(1)
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