Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!uunet!zephyr.ens.tek.com!tektronix!percy!m2xenix!quagga!undeed!barrett From: barrett@Daisy.EE.UND.AC.ZA (Alan P Barrett) Newsgroups: comp.protocols.tcp-ip.ibmpc Subject: Re: ping through gateways Keywords: ping, echo, reroute, gateway Message-ID: <1991Jun05.074538.26671@Daisy.EE.UND.AC.ZA> Date: 5 Jun 91 07:45:38 GMT References: Organization: Univ. Natal, Durban, S. Africa Lines: 35 In article , ccdw@hippo.ru.ac.za (Dave Wilson) writes: > If I set my gateway address to the IP address of a XENIX system, > and then ping the remote system, the XENIX system will reroute the echo > request to the PCRouter and all is well. However, if I set the gateway > IP address to one of the SUNs, the echo request is not rerouted and > there is no response. The Xenix system is not complying with RFC1122 section 3.1, but the Sun is complying. " 3. INTERNET LAYER PROTOCOLS " " 3.1 INTRODUCTION " " [...] " " Any host that forwards datagrams generated by another host is " acting as a gateway and MUST also meet the specifications laid out " in the gateway requirements RFC [INTRO:2]. An Internet host that " includes embedded gateway code MUST have a configuration switch to " disable the gateway function, and this switch MUST default to the ^^^^^^^^^^^^^^^^^^^ " non-gateway mode. In this mode, a datagram arriving through one ^^^^^^^^^^^^^^^^ " interface will not be forwarded to another host or gateway (unless " it is source-routed), regardless of whether the host is single- " homed or multihomed. The host software MUST NOT automatically " move into gateway mode if the host has more than one interface, as " the operator of the machine may neither want to provide that " service nor be competent to do so. --apb Alan Barrett, Dept. of Electronic Eng., Univ. of Natal, Durban, South Africa RFC822: barrett@ee.und.ac.za Bang: m2xenix!quagga!undeed!barrett