<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br></div><div>Hello all, I tried an experiment yesterday and compiled jnos with #define IPACCESS</div><div><br></div><div><br></div><div>I discovered I was no longer able to telnet to jnos, even after explicitly allowing tcp/23:</div><div><font class="Apple-style-span" color="#4964f6">ip access permit tcp all all tun0 23</font></div><div><font class="Apple-style-span" color="#4964f6">ip access permit icmp all all tun0</font></div><div><font class="Apple-style-span" color="#4964f6">ip access deny any all all tun0</font></div><div>(with the above, i could ping, but telnet didn't work.)</div><div>(I verified that ping stopped working if i removed /ip access permit icmp../ so the file WAS being read..)</div><div><br></div><div><br></div><div>then again after a final attempt specifying ONLY:</div><div><font class="Apple-style-span" color="#4d67f6">ip access permit any all all tun0</font></div><div>.. in hopes to at least get it working again without reverting to my saved binary. </div><div>(telnet still didn't work, but ping still did.)</div><div><br></div><div><br></div><div>switching binaries back, things worked just fine, so I'm pretty sure other system issues can safely be ignored.</div><div><br></div><div><br></div><div>At this point I still suspect that I'm not doing something right -- not USING the commandset correctly - , but reading what's in the docs, I can't find what I'm doing wrong.</div><div><br></div><div>Does anyone have a link or place to look for more detail on the ip access options available? </div><div><br></div><div><br></div><div>Thanks-</div><div>-jre</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div>Here's the snippet from the current documentation:</div><div>
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<!--StartFragment--><p class="MsoPlainText"><b style="font-size: 10px;">ip access
<permit|deny|delete> <proto> <sourceaddr[/bits]|all><o:p></o:p></b></p><p class="MsoPlainText"><b><o:p style="font-size: 10px;"> </o:p></b></p><p class="MsoPlainText"><b style="font-size: 10px;"><span style="mso-spacerun:yes"> </span><destaddr[/bits]|all>
<iface><span style="mso-spacerun:yes"> </span>[loport | all [hiport]]<o:p></o:p></b></p><p class="MsoPlainText"><o:p style="font-size: 10px;"> </o:p></p><p class="MsoPlainText" style="text-align:justify"><span class="Apple-style-span" style="font-size: 10px;">Display or set ip access
controls. The ip access command controls packet routing via the specified
<iface> by determining which source ip addresses <sourceaddr> are
routed to which destination ip addresses <destaddr>. If no ip access commands
are issued for <iface>, the default behavior is to permit all sources to
access all destinations. But once an IP access command is entered for <iface>,
all routes via <iface> that are not specifically permitted by an ip access
command, will be denied.<o:p></o:p></span></p><p class="MsoPlainText"><o:p style="font-size: 10px;"> </o:p></p><p class="MsoPlainText" style="text-align:justify"><span class="Apple-style-span" style="font-size: 10px;">Execution of this subcommand
will add or delete an access control entry in an internal table.<span style="mso-spacerun:yes"> </span>Incoming packets that would be routed via
<iface> are compared with the table entries for <iface>, in the
order that they were added, to determine if access will be granted (and routing
take place).<span style="mso-spacerun:yes"> </span>Access will be granted only
if an entry matching <destaddr> and <sourceaddr> is found with "permit"
set before either a match with "deny" set is found, or the end of the
table is reached.<span style="mso-spacerun:yes"> </span>The optional /bits
suffix to the ipaddr specifies how many leading bits in the ipaddr are to be
considered significant in the routing comparisons.<span style="mso-spacerun:yes"> </span>If not specified, 32 bits (i.e., full
significance) is assumed.<o:p></o:p></span></p>
<span style="font-family: 'Courier New'; font-size: 10px;"><br clear="all" style="page-break-before:always">
</span><p class="MsoPlainText" style="text-align:justify"><span class="Apple-style-span" style="font-size: 10px;">All addresses can be specified
by "all". Access can be made protocol dependent via the<span style="mso-spacerun:yes"> </span><proto> parameter. <proto> may be
'a' for any, 't' for TCP, 'u' for UDP, 'i' for ICMP, or the IP protocol number.
For UDP and TCP protocols, loport and hiport specify the port or range of TCP
or UDP ports for which the access control command applies.<span style="mso-spacerun:yes"> </span>If none or all is specified, all ports are
assumed.<o:p></o:p></span></p><p class="MsoPlainText" style="text-align:justify"><o:p style="font-size: 10px;"> </o:p></p><p class="MsoPlainText" style="text-align:justify"><span class="Apple-style-span" style="font-size: 10px;">Enter "ip access" to
display the table of current access control entries.<o:p></o:p></span></p><p class="MsoPlainText" style="text-align:justify"><o:p style="font-size: 10px;"> </o:p></p><p class="MsoPlainText" style="text-align:justify"><span class="Apple-style-span" style="font-size: 10px;">Access commands should be
entered from the most specific to the least specific, since the first match
(permit or deny) encountered for a given interface in the internal table is
definitive. For example:<o:p></o:p></span></p><p class="MsoPlainText"><o:p style="font-size: 10px;"> </o:p></p><p class="MsoPlainText"><span class="Apple-style-span" style="font-size: 10px;"><span style="mso-spacerun:yes"> </span># allow a
specific AMPRnet host access to the internet<o:p></o:p></span></p><p class="MsoPlainText"><span class="Apple-style-span" style="font-size: 10px;"><span style="mso-spacerun:yes"> </span>ip access
permit any 44.76.1.199 all eth0<o:p></o:p></span></p><p class="MsoPlainText"><span class="Apple-style-span" style="font-size: 10px;"><span style="mso-spacerun:yes"> </span><span style="mso-spacerun:yes"> </span># but deny all others except UDP (eg, DNS)
access<o:p></o:p></span></p><p class="MsoPlainText"><span class="Apple-style-span" style="font-size: 10px;"><span style="mso-spacerun:yes"> </span><span style="mso-spacerun:yes"> </span>ip access permit udp 44/8 all eth0 all<o:p></o:p></span></p><p class="MsoPlainText"><span class="Apple-style-span" style="font-size: 10px;"><span style="mso-spacerun:yes"> </span><span style="mso-spacerun:yes"> </span># permit only AMPRnet hosts access to RF
port<o:p></o:p></span></p><p class="MsoPlainText"><span class="Apple-style-span" style="font-size: 10px;"><span style="mso-spacerun:yes"> </span><span style="mso-spacerun:yes"> </span>ip access permit any 44/8 44/8 2m<o:p></o:p></span></p><p class="MsoPlainText"><o:p style="font-size: 10px;"> </o:p></p><div><br></div><div><br></div><div><br></div><div><br></div>
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