<div dir="ltr">My router is a Linux PC. It is connected directly to the cable modem. So I know which addresses the router has:<div><div>>ip addr show </div><div>1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group defaul</div><div>t qlen 1 </div><div> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00</div><div> inet <a href="http://127.0.0.1/8">127.0.0.1/8</a> scope host lo </div><div> valid_lft forever preferred_lft forever</div><div> inet6 ::1/128 scope host </div><div> valid_lft forever preferred_lft forever</div><div>2: enp1s10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP</div><div> group default qlen 1000 </div><div> link/ether 00:d0:b7:3f:3f:d7 brd ff:ff:ff:ff:ff:ff</div><div> inet <a href="http://73.37.165.179/23">73.37.165.179/23</a> brd 255.255.255.255 scope global enp1s10</div><div> valid_lft forever preferred_lft forever</div><div> inet6 2001:558:6014:3e:a038:4872:4d66:a81/128 scope global</div><div> valid_lft forever preferred_lft forever</div><div> inet6 fe80::2d0:b7ff:fe3f:3fd7/64 scope link valid_lft forever preferred_lft forever</div></div><div><div>3: enp0s7: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP</div><div>group default qlen 1000 </div><div> link/ether 00:23:54:f9:4c:c1 brd ff:ff:ff:ff:ff:ff</div><div> inet <a href="http://192.168.42.2/24">192.168.42.2/24</a> brd 192.168.42.255 scope global enp0s7</div><div> valid_lft forever preferred_lft forever</div><div> inet6 2601:444:47f:c71e::1/64 scope global</div><div> valid_lft forever preferred_lft forever</div><div> inet6 fe80::223:54ff:fef9:4cc1/64 scope link</div><div> valid_lft forever preferred_lft forever</div></div><div><br></div><div><br></div><div>Can a cable modem have multiple addresses? I wouldn't think so as it should just be a bridge.</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Sep 3, 2017 at 9:57 AM, Andrew Lunn <span dir="ltr"><<a href="mailto:andrew@lunn.ch" target="_blank">andrew@lunn.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">On Sun, Sep 03, 2017 at 08:19:13AM -0500, gregrwm wrote:<br>
> On Sun, Sep 3, 2017 at 7:47 AM, Jon Schewe <<a href="mailto:jpschewe@mtu.net">jpschewe@mtu.net</a>> wrote:<br>
><br>
> > I'm trying to debug some issues with my internet connection. I have<br>
> > Comcast and the traceroute results are not coming back what I expect. On my<br>
> > router my routing table looks like this:<br>
> ><br>
> > >netstat -rn<br>
> > Kernel IP routing table<br>
> > Destination Gateway Genmask Flags MSS Window irtt<br>
> > Iface<br>
> > 0.0.0.0 73.37.164.1 0.0.0.0 UG 0 0 0<br>
> > enp1s10<br>
> > 73.37.164.0 0.0.0.0 255.255.254.0 U 0 0 0<br>
> > enp1s10<br>
> ><br>
> > Given that, I expect the first hop in a traceroute to be 73.37.164.1, but<br>
> > it's not.<br>
> > >traceroute -n 8.8.8.8<br>
> > traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets<br>
> > 1 96.120.48.69 8.890 ms 14.915 ms 15.659 ms<br>
> > 2 68.85.168.121 14.833 ms 15.604 ms 15.575 ms<br>
> > 3 96.108.188.62 14.502 ms 14.484 ms 14.665 ms<br>
> > 4 96.108.188.101 15.455 ms 16.596 ms 16.574 ms<br>
> > 5 68.86.94.81 28.011 ms 26.859 ms 26.841 ms<br>
> > 6 68.86.85.158 24.289 ms 19.757 ms 22.386 ms<br>
> > ...<br>
> ><br>
> > Can anyone explain what's going on here?<br>
> ><br>
><br>
> your traceroute addresses starting with 68.85.168.121 identify as comcast<br>
> hosts.<br>
<br>
</div></div>96.120.48.69 is also a comcast address is you do a whois for it.<br>
<br>
Routers have multiple interfaces, and each interface should have an IP<br>
address. 73.37.164.1 is the address of one interface on the<br>
router. Quite likely, 96.120.48.69 is an address on one of the other<br>
interfaces of the router.<br>
<br>
Andrew<br>
<br>
<br>
<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><a href="http://mtu.net/~jpschewe" target="_blank">http://mtu.net/~jpschewe</a><br><br></div></div>
</div>