With bouncer can go a lot things wrong, also with proxyserver. What do you exactly want? Just hide ip from other people doing .whom or gain anonymity? Need some more infos here.
If your using eggdrop irc bot version(s) 1.6.17 or 1.6.16 there is currently a patch for each version to hide users host/ip address from .who & .whom DCC commands on the eggdrop partyline. You can view the available patches as well as alot of others here. As of yet, 1.6.18 dosen't have a patch for this, and i haven't tested using it on 1.6.18+ versions of eggdrop irc bots. However, there is a little work around for this. That is by d/l'ing the eggdrop1.6.17 applying the nohostwhowhom patch and then d/l'ing the eggdrop1.6.17-1.6.18.patch and upgrading to the latest version that way. You can d/l the eggdrop1.6.17-1.6.18 patch as well as the 1.6.17 source code at EggHEADS.ORG.