1 |
I just installed a T1 to a new ISP using a Sangoma CSU/DSU card. |
2 |
I thought I could use aliased IPs on existing gigE NICS on our LAN |
3 |
to set up the hosts that need an internet routable presence. |
4 |
Maybe that can be done, but not by me. I don't understand enough. I |
5 |
can get it to work on the system with the T1. But not on another |
6 |
computer over the LAN. |
7 |
|
8 |
On the system with the T1, I have a gigE to the LAN, and one of the |
9 |
ISP's IPs for asterisk (as an alias to the T1). That works okay. It |
10 |
worked okay with the ISP's IP as an alias to eth0, too. |
11 |
Edited output from ifconfig: |
12 |
(this is the gigE NIC connected to a switch for our LAN) |
13 |
eth0 Link encap:Ethernet HWaddr 00:07:E9:19:F3:F5 |
14 |
inet addr:192.168.1.17 Bcast:192.168.1.255 Mask:255.255.255.0 |
15 |
|
16 |
lo Link encap:Local Loopback |
17 |
inet addr:127.0.0.1 Mask:255.0.0.0 |
18 |
|
19 |
(this is the T1. with the internet IP as an alias) |
20 |
w1g1 Link encap:Point-to-Point Protocol |
21 |
UP POINTOPOINT RUNNING NOARP MTU:1532 Metric:1 |
22 |
w1g1ppp Link encap:Point-to-Point Protocol |
23 |
inet addr:209.101.232.82 P-t-P:209.101.232.81 Mask:255.255.255.252 |
24 |
UP POINTOPOINT RUNNING NOARP MTU:1500 Metric:1 |
25 |
w1g1ppp:0 Link encap:Point-to-Point Protocol |
26 |
inet addr:216.132.251.226 P-t-P:216.132.251.226 Mask:255.255.255.224 |
27 |
UP POINTOPOINT RUNNING NOARP MTU:1500 Metric:1 |
28 |
|
29 |
(this is the routing table [route -n]) |
30 |
Destination Gateway Genmask Flags Metric Ref Use Iface |
31 |
216.132.251.227 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 |
32 |
209.101.232.80 0.0.0.0 255.255.255.252 U 0 0 0 w1g1ppp |
33 |
216.132.251.224 0.0.0.0 255.255.255.224 U 0 0 0 w1g1ppp |
34 |
192.168.2.0 192.168.1.12 255.255.255.0 UG 0 0 0 eth0 |
35 |
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 |
36 |
127.0.0.0 127.0.0.1 255.0.0.0 UG 0 0 0 lo |
37 |
0.0.0.0 209.101.232.81 0.0.0.0 UG 0 0 0 w1g1ppp |
38 |
|
39 |
The problem I'm having is with an alias on another computer that |
40 |
needs to be on the internet. It is the IP 216.132.251.227. Traffic |
41 |
internal to our LAN is routed to the computer that has that alias |
42 |
(192.168.1.6). But, traffic coming from the internet gets to 209.101.232.82 |
43 |
and stops according to traceroute. |
44 |
I'm too ignorant to understand why the host route doesn't work for |
45 |
packets coming from the T1 (from the internet), and get sent to the |
46 |
computer that handles that IP. This is the latest in a series of |
47 |
attempts. I've also tried putting the 216.132.251.224 network on the |
48 |
LAN. I've tried using the 216.132.251.227's LAN address (192.168.1.6) |
49 |
as a gateway for the host route. I've tried removing the |
50 |
216.132.251.224 network route entirely, and just having host routes. |
51 |
|
52 |
What I was hoping to do was have one computer (192.168.1.17) |
53 |
connected to the ISP with a T1, and serve as a router for the ISP's |
54 |
IPs. That would also be connected to the internet with one of the ISP's |
55 |
IPs for use by asterisk (216.132.251.226). This seems to be working |
56 |
okay. |
57 |
I wanted another computer (192.168.1.6) to have an aliased ISP IP |
58 |
(216.132.251.227) that would let that computer also have an internet |
59 |
routable address. This is what I don't seem to be able to do. The |
60 |
computer with the T1 doesn't seem to route packets from the internet |
61 |
to the other computer over our LAN. It does for packets originating |
62 |
from our LAN. But not for packets from the internet. |
63 |
I know my error is going to be obvious to everyone who actually |
64 |
understands this stuff ;) I hope I've given the info to make things |
65 |
clear. |
66 |
I can set up a small Fast enet switch for the ISP's network, I |
67 |
guess. But I was hoping not to need to do that, and add more NICs to |
68 |
the computers that eventually need to be on the internet. But maybe |
69 |
that is what I need to do. |
70 |
Any and all advice (including things to read to decrease my |
71 |
ignorance) appreciated. |
72 |
-- |
73 |
gentoo-user@g.o mailing list |