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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] host- name 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 dig- its; 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 previos 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 - value is in hex bytes separated by :s Default: Length may be omitted to get correct value -bul x Withdrawn routes length Default: Correct -buw x Withdrawn route.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 (undocumented) Default: 1 -re x Add a RIP entry. Format is: Address family:route tag:address: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/address/len/metric Default: ::/0/128/1, any option my be left out to use the default -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 August 2026 SENDIP(1)
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