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Testing AT&T, so routing setup

Test context:
Having problems with my internet connection, technicians came out, said they fixed the problem, and left. The connection was a bit better (fewer lost ping packets), but nowhere close to where it should be. They say they see no other problem with their equipment, the problem is probably with my equipment. Repeat that exact same story two more times in the following week. 

Here's what mtr shows me:

HOST: yes.mynet.net             Loss%   Snt   Last   Avg Best  Wrst StDev
  1.|-- 192.168.0.1              0.0%   100    0.4   0.8 0.3  20.1   2.4
  2.|-- 77.219.160.1            53.0%   100   71.3 100.7 9.1 321.5  90.4
So what I'm thinking is to take an RPi and my DSL modem and plug it in directly to the box outside (on the customer side, of course) and test it from there. If I get the same results from there, I've eliminated everything on my side as the source of the problem except the DSL modem and the RPi. Since, however, I get the same results on four other nodes inside the house as I get from the Pi, the problem is likely not the Pi's. 


Setting up for testing:
Working on the Pi just from the bash prompt as root, how do I set the routing table (etc.) to connect directly to the DSL modem? The routing table on my router currently shows: 

# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface 
77.219.160.1    0.0.0.0         255.255.255.255 UH 0      0        0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U 0      0        0 br0
169.254.0.0     0.0.0.0         255.255.0.0     U 0      0        0 br0
127.0.0.0       0.0.0.0         255.0.0.0       U 0      0        0 lo
0.0.0.0         77.219.160.1    0.0.0.0         UG 0      0        0 ppp0

Here's the Pi's current routing table:
Destination Gateway Genmask Flags Metric Ref Use Iface 
0.0.0.0         192.168.0.1     0.0.0.0         UG    0 0        0 eth0
10.10.0.0       0.0.0.0         255.255.255.0   U     0 0        0 wlan0
192.168.0.0     0.0.0.0         255.255.255.0   U     0 0        0 eth0
To plug the Pi directly into the modem, I think I'm going to need to run ppp and then run some commands to temporarily set the IP address of the ethernet port (eth0) and the routing table. I much prefer to do all this without changing config files so that when I reboot the Pi, the settings go back to their original. What do I need to 'apt-get' for the ppp executables? And... I'm more accustomed to using the 'route' command to manually set up a routing table, but have used 'ip' commands too, if that's more familiar to you. 

Thanks.
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